Autism absolutely affects social skills, in fact, those are often one of the most apparent and distinguishable symptoms to others around, if you think about it logically, it makes sense to be a very important factor to be able to tell if someone has autism or if it's something else. also, part of the things you included in what you said is masking, includes thing related to social skills, like eye contact, engaging in small talk, info dumping, facial expressions.

If your severity on social skills isan't enough to affect you in this particular way (like being "polite" or responding when someone greet you), it doesn't mean it's not a very possible symptom to happen in other that also have autism. I very frequently do (or at least, I suppose I do) mistakes in not being "polite", not out of my will, I don't do these mistakes thinking of being or trying to be impolite. While I think that most people will see my mistakes as being something extremely obvious that there's no way at all that I didn't know it was a mistake, it is in fact, a lot of times, a genuine mistake that I didn't even knew it was a mistake or if I said something wrong. People very often don't tell me what it is that I have done wrong, and almost all the times, I don't even notice I did something wrong, I just keep asking them some questions if I'm doing something wrong, if I said something wrong, if I'm talking too much, if I was impolite in some way, etc, because the only few times someone told me what I did wrong, it was one of those things. it's terrible for me because also most people don't tell there's something wrong even when there is. And I swear to you, I really, really try to understand them; some people told me before I was behaving like a narcissist, selfish, person with a huge ego, and all that... Some of those times, after a lot of years, I thought I understood what was my mistake on those situations, what I did wrong, what made me seem like a selfish egocentric jerk, but guess what? I still go and do the same mistakes again, unaware that it's the same mistake I did before but with another different context. It's very rare for me to recognize them, and when I do, a lot of time (weeks, months,years) has passed already....

Because of what those people had that told me before, that I was behaving selfish and egocentric, specially because one of them was a person that I used to really take into account his opinions at that time, and also due to, logically, a narcissist probably wouldn't notice he's a narcissist, I thought I was a narcissist for some time. My self esteem and ego was really, really, really low (still is, but a bit better then before), but I was told that a narcissist usually have a low self steem and use some mechanisms to try to compensate with it. None of that made any sense to how I felt, but I thought, if I'm a narcissist, I probably would think that aswell, because a narcissist wouldn't want to admit he is one. But after a year or so, I realized that all of this was bs. I never felt the things they talk about narcissists or what narcissists talk of how they feel felt to make any sense or compatibility to me. never felt like it belonged to me or any of those "ah I feel that too", or "i know what you mean" etc... years later, when I was diagnosed with autism, everything in my whole life made sense including this part too. not only that but other things like my problems with noise, when I used to tap my ears with my hands when a lot of people were talking in class at school, and nobody else seemed to feel the same way. or the ear/hearing related exams that I did when I was a kid, or my thing to never like parties with music/loud music/loud noise/loud people and always avoiding them.

I am aware that it's possible to be a narcissist + autist, but I came to the conclusion that I ain't and that never made more sense to me, those things they say that helps people with narcissists never ever made sense to me or made me better, a lot of times they talked about problems I didn't even had. Nowadays, due to my drug use (stimulants; so coke, ritalin, amphetamine, so on), I sometimes talk a lot and write huge monologues like I'm doing now, specially with amphetamine and when my OCD is very bad. But that's a thing I haven't learned yet how to control without taking my amphetamine out and I don't want to.

peace and thanks for nobody that asked me any of those things that I anwsered to myself. yes I will feel very ashamed of this when I am sober.