This is a huge one, and it's not so simple to solve, but I've been able to sort of identify the problem.
I remember one time I had a pretty bad meltdown in front of a class. I was filled with so much anger and hate at the moment, and I let it all out. Eventually I remember the next day the teachers had essentially told me they were really concerned with me. Sadly I've never been able to escape labels, and these labels affect the way my teachers often treat and perceive me. I remember getting that aura of them thinking "it must have been my autism, and therefore must be my fault". It's not pretty, and while you may or may not have autism, nonetheless the fact that your problem may be massively misunderstood never sits well.
But the most important thing I realized was this: I'm not a perpetrator; I'm a victim. My condition isn't necessarily so easy to comprehend, and the usual explanation was going to be wrong. The people who try to label me as vaguely delinquent can go kiss my ass, because I know full well that what happens isn't entirely my fault. I'm not saying don't take responsibility or act in such a way where you come off in a bad way, but I think remembering that overall, that you were a victim, helps.
Sorry if this doesn't make a whole lot of sense since our situations are likely different; I was put through a lot of mental abuse throughout my school years and the teachers often tried to make it seem as if it were all my fault, and as if I were badly flawed. I don't take their attempts to undermine me so seriously.