Whether you're strange or not isn't important here, what you wear and how quiet you are is your business. He should be polite to you as that's part of his job. Also if I understand correctly you said he won't give feedback to you and another girl but other people? Are these other people men (his comments sound a bit sexist). I've had some experience of sexist men making comments about me, like I asked for their opinion. He doesn't sound like a good instructor. In my opinion there's two things you can do, either continue and ignore his comments, maybe just laugh at them or actually ask him what he means (maybe it's not what you think) or go elsewhere.