I get ignored quite a lot but I've no hard evidence that I get judged very much. People can't do both at the same time.
If I go to a party or similar-format social event, I don't know how to engage with people. Occasionally I might greet somebody I vaguely know, but after that I don't know what to say, and usually they're soon gone. It's a lot better when there are several people around that know and like me, but otherwise it's mostly just embarrassing, I have no role, what am I supposed to do? Stand / sit about staring into space? It also brings back horrible memories of when I was a teenager at a youth club, and rather than give up I'd try to force things to fit, saying whatever came into my head and talking incessantly until they practically ran away. The only time I've felt OK about spending an evening in a pub was when I was in a band. We'd usually not know anybody at the venue so we'd tend to stick to each other, and we were fairly close, and of course we had a common practical purpose so there was plenty to talk about.
If the group is small enough, suddenly it's less of a problem. One-on-one, it's no problem at all. There's less of a "them" to socialise with itself while it ignores me, and technically I can talk for 1/nth of the time, where n = total number of people in group. People at a gathering tend to stay in small groups, so you'd think that would work for me, but I guess it's something about the permission to muscle in, if I'm in a small group for another reason then that permission has already been established, but at a gathering I'd have to do the "mind if I join you?" thing, which I don't think I've ever done.
As for the judgement side of it, socially I wouldn't want anything to do with highly judgemental people, so if they think I'm a jerk, that's good, I'm better off without them. But I seem to have learned how to smell them and avoid them. If a group of people is too hard to work with socially, I stay away. I know there are people who aren't like that, so it makes no sense to waste time trying to fit in with the wrong crowd.