It depends on the type of disrespect, the intention behind it, the offender and secondary, on my mood.
But you already limited it to disrespect that's not directed at autism. I can also say I most often have no idea what to do about severe bullying of a group directed at me as a stand-alone person. That's disrespect in a sense too, if they implore your weakness/autistic issues. I'm willing to do everything, but nothing works.
Seriously, no idea what to do about it - kicking their butts badly only ever resulted in me taking the blame... utterly crazy...
About normal disrespect:
If it is an unintended disrespect, I'll just comment in a way that makes the other stop in track and explain the issue. If it is intended, I'll either let it slip or not let it slip depending on the following:
If the offender has no further impact on my life, I usually do not care. If the offender has any impact on me that affects me negatively and limits me, then I'm not willing to back down. How I go about it depends on my mood:
If I think the patience is worth it, I'll just explain the whole thing by carefully manipulating the other into what reasoning I see fit. If, however, I'm in the right mood and also think this whole matter is a waste of energy, I'll get verbally abusive right back. Which usually means that I win, because I know exactly where to hit somebody worst.
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Autism + ADHD
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The trouble with having an open mind, of course, is that people will insist on coming along and trying to put things in it. Terry Pratchett