Lack of self-reflection?

A belief about sociopaths that I hear pop up quite a bit, including from some people who are somewhat inculcated in the field of psychology, is that a sociopath would never self reflect and wonder if they were a sociopath. I have always wondered what the source of that factual statement is? Does anyone know?

Also, I'm curious what the explanation would be if such a phenomenon were true. Are sociopaths then just very unself-aware? How is it that they are able to manipulate and read people if they can't figure out something so obvious as matching a series of diagnostic criterion to a list of basic personality traits? Or do sociopaths supposedly think too much of themselves to even consider themselves damaged? Because the thing is that I don't think I know of a single sociopath (including the thousands that have written to me and that I've encountered in other venues) who considers sociopathy to describe something bad/damaged, particularly not at first. They all seem to have, at most, sort of a gee whiz reaction, like -- there may be something to that, but who cares, that's just how things are -- or perhaps even more often -- well, of course, who wouldn't want to have those traits and be able to do these things? So I don't think the grandiosity prevents this type of self-reflection either because the sociopath doesn't see the label as conflicting with something great and remarkable.

In fact, it doesn't even require that much self-reflection to recognize oneself as a sociopath when you think about it. I think it's pretty obvious to us that we're different. And we certainly use particular traits often enough (daily) that even if we hadn't thought of it much before, if someone told us what manipulation was and then asked us if we were manipulative, we'd see that we are.

Even my down syndrome relatives are aware of their disorder, despite one being quite low functioning. Still, they don't lack the capacity to understand that there is something different about them from the other people they know. I know that they experience frustration with their difficulty in communication. I know that they understand that the lives they live are drastically different from everyone they see around them. And even though they have somewhat the minds of children, they are also keenly aware that they are adults, if for not other reason than their sexuality, or now the physical aches and pains of aging. And if they can figure something like that out, it seems almost crazy to think that sociopaths would categorically be incapable of doing likewise.

A reader mentions this issue among others:

I'm a 27 year old female, that has been doing some self reflection, because lately my views on things have changed over the past few months. A little of my background history, I was born with an absent father, although in my early years I didn't understand the situation, and in my teenage years I became angry because of my lack of a father figure I began to question my value. My mother was always a very good parent in my opinion and always tried her hardest to provide for me, also no abuse or violence in my family. In high school I was shy and consequently bullied. One day as I passing notes, I had written something that was read by a teacher, and subsequently I was escorted out of the school and taken to a Mental health facility for two weeks. I don't recall the contents of the note something violent in nature I suppose, but in any event I was treated for depression because I had also been cutting at the time. I was treated by a psychiatrist all throughout high school and after I graduated. On and off depression medication for years. Once I graduated, I began to participate in activities with others that I never did in High School because I was shy and withdrawn such as pot smoking and various sexual conquests. I must make a side side note on my activities, I never had any regrets with anything I've done, or still don't. I got involved with a man when I was 19, and he was 50 years old, not because I ever had feelings for him, but because of his infatuation for me, allowed me to use him for things. He bought me a smartphone, bought me alcohol, drugs, took me to really nice hotels to spend the night, and all I had to do was be intimate with him. I realize that he was using me as well. I'm positive he was going through a mid life crisis, but it never bothered me. He had a girlfriend at the time, but to me they weren't married, and I wasn't serious about him. In my mind I was learning something about relationships and people and gaining experience in how to deal with people. One story always entertained me, he didn't mind what I did to him, I guess he liked women who were very dominate in their relationships, so I pushed that. I suggested cutting him, so I could take his blood, he let me, I didn't like bloodletting in the end but I kept pushing, it was fun. I had a bike chain in my hand one night because I wanted to chain him up but I had an idea, I asked him if he thought I would hit him with it, he said something like he didn't know if I would, then I hit him with it. The next day he had a gash on his cheek and a huge bruise. When it happened I felt excitement not guilt, it was liberating in a way. Of course I feigned guilt and pretended that I was sorry, and all was forgiven. After awhile I eventually got tired of that relationship, but I guess I had taken it too far, and his girlfriend found out and had him end it. I didn't think twice about it. Eventually I grew out out of the party scene as I got older and I matured. I still had depression up until two years ago when it simply disappeared. I still suffer with minute anxiety which is manageable. I have to say the only times in my past I actually got upset was when I was wronged in some way, but I had depression during those times. But recently I have been "feeling"  especially apathetic. I don't understand why people are so emotional or empathetic, it annoys me when people are so fake when people tell them about their problems, I hate that I have to pretend to be sympathetic. I honestly have only two people I care about my boyfriend, and my Mother, the latter I would die for. Everyone else could die tommorow and I wouldn't care. I don't care about a lot of things, and people surrounding me always think I am just a very patient person, but I truly don't care. Based on the information I have given is it possible I am a sociopath? I am curious, but I also have read that sociopath's don't research who they are and don't care. I'm not worried, I am amused with myself, and am curious about the human mind, mine in particular. I would appreciate your insight.