I have some experience with this,...but as I have aged and have become more self-aware I am more likely to take into account perspective and context. This is not to say that I don't let my mouth open before thinking on occasion. When I was younger, I would just let things fly out of my mouth,...sometimes it was in some attempt to be witty and get a laugh,...and it would backfire with some very concerned and disturbing looks from others. My experience with Facebook,...I was consistently getting nasty feedback, ...then I would have to go on some sort of long explanation,...which then led to a long back and forth,...it just sucked. Dropped Facebook. It was partially my fault for responding to a stupid meme or some false information that was not fact checked,...drove me nuts,...of course there was always a troll just waiting to pounce on whatever was said. I don't understand the mentality of a troll or why the pervasive false information being posted and shared.
The online social media experience, for the most part, has always been a negative one,...with exception to this site, which, is more or less, a support group.
I totally get the frustration and anger with being mischaracterized,...in part, because it is false, but also because people are spreading the lie about you. I get angry when I am being accused of being angry, when I wasn't. "You were angry and yelled at me!",....literally, I am as monotone as anyone you'll ever meet,...I've never yelled at anyone before,...and I was never angry. No one except my wife has seen me angry,...and it's only been about 3 times in my life. People see and read what they want to see,...it may be more about their personality and outlook on life, rather than yours,...but it is still quite frustrating to deal with people like that.
I am not sure, but I think it might have to do with a bit of "Aspie honesty",...the stereotypical "open book", share too much, will tell you the truth whether or not you want to hear it,...without any sense of "social grace". Social politeness often includes not reacting and keeping your mouth shut, even when things are said and done that are questionable. I see this all the time at work,...the doctors are really good at this,...keeping that even keel, a little smile,...but they are not going to get into a potential argument when a patient or family member is spouting off some lunatic-fringe healthcare conspiracy theory under the influence of stress and fear.
In short, it may not be you, per se,...but rather it may say more about the people you are interacting with,...and how you're handling it.