He’s been giving mixed signals as well, such as dressing fancy all of a sudden, staring at me a lot, sometimes being nice and other times rude. I get that he’s unstable (obviously) and he generally acts like this with people he’s attached to but it still makes me wonder if he would treat me this way if he actually did have feelings for me.
The simplest answer is no. Making fun of someone because of neurodivergence is the action of a bully, not someone who is nervous and unsure of how to express their attraction.
I’m not in your shoes, and I only have a limited view into the situation. As an outside observer, I would recommend at the very least establishing boundaries against screaming and belittling your neurodivergence (i.e. Saying plainly that behavior is not OK), or cutting off all contact entirely if possible.
Things will likely only further degrade otherwise, and his behavior will only continue to be hurtful and manipulative.