Sorry this happened. This is the most frustrating feeling when you try to pick up some confidence and the teacher of all people says some shit like that? You shouldn’t have to explain yourself as you’d think a teacher would have at least a little idea of what’s going on. Maybe just mention it to him/her and explain how awful of a comment that was. The stuttering-lack of intelligence stereotype that exists is so awful. I swear all us are so much smarter and more aware of our surroundings than any other group of people in the world. Your teacher sucks. Keep doing you !