I realize that usually when we tell others of our ASD/HFA condition (called Aspergers for so long, in my case), we tend to water it down or downplay it, e.g. "I've made great strides since, but still struggle with nonverbal nuance / find ambiguity in subtle emotional expression..." or "it only becomes more pronounced when I'm stressed", or such mitigation comments.
Unfortunately, more often than not, this has gotten us a derisive response, or rebuke, or flippant attitude, or some veiled hostile or condescending remark.
It's ostensibly b/c of the way society-at-large views psychiatric disorders.
How about if, when people suspect "something's up" and they start treating you in a way that we're all too familiar with
or they directly ask you why you have odd mannerisms or something of the kind, you were to simply be unrepentant about it, don't sugarcoat it, just say something like "well, I'm on the autistic spectrum, but at the more high-functioning end - many people are these days, it's not a big deal".
In other words, try to gently tilt it towards it being the other person making a big stink about it, that it's *their* problem (not yours!) and you're not being overly meek.
IF they respond abrasively (which, unfortunately, many people will), you could downplay it (borderline-lie) and say "oh! well I can't say that I've gotten that kind of reaction before". - I know it's not in our nature to be manipulative, but something you need to plant the seeds of doubt there and give the other person cause to think that maybe they're the ones acting unreasonably.
IF they respond by criticism, rebuking, lecturing or such (e.g. "so why don't you just try harder??" or "oh, I see - how long do you intend to continue using that excuse?", or some asinine rebuke on shouldn't you be concerned with how others see you or self-respect or putting others "at ease"... then again, it's best to use a bit of "white manipulation" and reply something like "well, if we want to talk about respect, then you can't really respect somebody who just kowtows to other people's images of how they want them to be; people earn respect for standing up for their principles. The truth is that I'm an honest, decent, hardworking guy with a great sense of humour and I'm very supportive with the people who treat me right."
Hopefully, that will get them to relent, and realize they're the ones being obtuse...but there might always be the odd exception
Of course, it might be tricky during that "late teens to mid-twenties" volatile demographic for young males, where a hostile peer might respond with "are you a f***ng incel / virgin?" or "you must have had a horrible childhood" or whatever silly remark predicated on some cultural stereotype they conjured up in their mind... then all that you owe them is an exaggerated bewildered reply of "wow, I don't know where THAT'S coming from!!"