I will commonly listen to more mainstream music with my headphones around other people because I am afraid someone will ask what I am listening to and hear my very odd and lesser known taste and immediately think the worst
How do you know what kind of music will make them think the worst about you?
I listen to triphop and I know a girl who makes fun of me for it.
Listening to certain types of music to gain the approval of others is inappropriate behavior since you are faking your preferences. You should be true to yourself and listen to the music that you enjoy and not let the opinions of others dictate your own tastes.
Right, who cares? I'll listen to whatever the fuck I want to listen to.
That's the attitude. You don't want to be friends with people that make fun of you for the types of music you listen to. You don't want to change because of others either.