Is it wrong to call people autistic when I'm autistic?

There was this annoying situation at my school that happened and it basically boils down to 2 main culprits, I'll call them R and N.

So R is a loser that sees anyone beneath him as fodder for when he's bored in class, this obviously includes me. Sometimes I like just really playing into the autistic stereotype, because it feels good to make other people laugh even if deep down they're laughing at me and not me indulging into it. At the start of the semester R noticed this and he would constantly interrupt class just so he could some sort of reaction out of me, but I eventually got bored and started acting normal again.

N is a problematic black kid (Him being black is important I'm not stereotyping him.) with "something", I don't know what, it could just be general anger issues but he gets a detention literally EVERY week, I would know, I've seen it happen so many times before. I don't want to be rude but either he's deeply autistic or his parents are super abusive, maybe even both.

One last thing before I get into the story, is that my main strategy to deal with people that are hitting or bullying me in class is to just sit there looking at them condescendingly, its extremely effective and almost always saves you from getting into trouble while making you look way cooler. Now outside of class, it obviously doesn't do anything but still.

Getting into the actual story, R, goes to N because he's bored and says that I said the N-Word (I'm white) and N believes it completely, so N goes to me and asks whether I said the N-Word, so I jokingly go, no R said the N-word, as a joke, because I know it doesn't change anything whether I defensively deny or even go along with it, nothing changes. So he starts lightly hitting me and gradually getting more violent so I do my main strategy giving him a nonchalant look as I wait for the teacher to notice what's happening. She is taking so damn long to notice, and eventually he punches me in the gut, and it actually hurts. So now I'm getting really annoyed, the teacher STILL hasn't noticed what's happening, but I keep to my senses and instead of fighting him, I go and call him autistic, and then shortly after explain that I'm autistic and it's incredibly easy for me to tell when someone else is also autistic. Which is true, I can always tell whether someone's autistic and in the very least has some other mental disorder, and it's not like I want to it's just something that comes naturally when I observe someone for a little bit.

So then N starts like hyperventilating and repeating to himself, "I'm NOT autistic" over and over and it's gets kinda creepy. He gets a lot more violent, threatens to break my glasses, (He doesn't) and then throws my textbook at me, which is when my teacher FINALLY notices it, breaks the fight up and makes us go outside and then what happens next isn't that relevant to the point of this post. I did apologize to N because I don't think it was his fault that this happened at all.

Teacher had the talk with me and after explaining everything that happened I went home and got the verdict emailed to me. They're going to have a talk with my parents AND I've gotten detention, which is such a department of education moment.