Psychology of rudeness and how to confront

Your boyfriend's an asshole. Simple as that. Insecure and self centered.

Although I totally agree with bonestructure's answer...I was going to say the YOU ALREADY ANSWERED ALL OF YOUR OWN QUESTIONS!!! And whatever it is that you are sensing...the "shoulds" is right, and you know your right! What person would not want to take interest in their girlfriend's music/art if she obviously loves it . I think you man has a really deep rooted psychological problem that stemmed with the relationship between him and his MOTHER ...Perhaps she ignored him and listened to music all the time? Or maybe she was a musician or music teacher and also just happened to not pay him enough attention? Who knows, he's definitely got some issue that connects that...Freud would love this one! And I sense major JEALOUSY! For what reason, I do not know, but I bet it could be related to the mother thing...just out of major curiosity....what is the relationship between him and his MOM? Check it out and you will be surprised at how many questions will all be instantly answered like an opened flood gate!!! You need to know why he is so self-centered and crazy about this. One thing I must say, if you are intimate with him~he can't even have the respect for you to share your interests? I bet if he was really interested in something...OH LORD! You'd have to like it too, or he'd throw an absolute hissy fit!!!!!!

Oh, and as far as confronting...I'd just be totally honest and say "What's your problem!?" I would!

nomo4, it could be that you are boring, and what you think is funny is equally boring. 

He has put up with you much too long.

He should find someone better.

There is no way anyone can give you an explanation for his behavior.  Why don't you just ask him why he does these things and take ownership for yourself by expressing your feelings to him?  The psychology of the question for me is why do you feel the way you do?  You state you have no evidence about some of your feelings, then were is this coming from?  Your feelings and reactions are making a statement about you.  They are trying to tell you something that you are projecting onto him.   His behaviors may stimulate these negative feelings in you, however, your experience of what he triggers is about you, not him. 

Your question is very focused on him.  What about you?  What is your role in this relationship?  What does this relationship do for you?  Why is is you cannot talk with him directly and honestly about how you feel?  He doesn't have the answer to those questions, the answers lie with you.  I would suggest taking a look at yourself and stop analyzing him.