That stinks.
Unfortunately, he can tease you about your disabilities without your permission. People are mean and tease other people all the time. He can be a jerk any time he wants to. I don't understand why people want to be jerks and I don't understand why they want to be mean.

He doesn't understand. That's for sure. If he understood, he wouldn't tease. But he can't understand. Lots of people make fun of things they can't understand...

I'm sorry. Most people are just thoughtless, ignorant and self-centered. They aren't evil. They don't mean to hurt us. They just do.