(Ex?)Crush made fun of me for being neurodivergent, screams at me. is this how people actually like when they like you?
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.
If they mistreat you before anything actually takes shape, it’ll be worse in a relationship. Some people are severely underdeveloped emotionally and don’t even know why they behave as they do. I was like this when I was young. It’s taken decades of therapy and working on myself to be emotionally healthy. Find another.
There are many people in the world. You don't have to stay attached to this person if his behavior isn't something you like. And it is ok to wait for a person to come along that treats you the way you would like to be treated (you deserve to be treated well). Best of luck!
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.
The neurodivergent attract the neurodivergent like magnets; it's either a strong, irresistible bond or a complete, u equivocal rejection, never in between.