Well first can I just say that posting in red makes it hard to read.

I'm at Uni now on my 2nd first year (course change) and it seems most of my friends like heavy rock stuff, and one of them knows I like Bon Jovi but didn't say anything negative.

I think by the age of 18/19 people stop insulting others for such personal choices as music taste etc, as by the time they've gotten older they are more intelligent and peer pressure is reduced, so there is no longer the feeling that you have to fit into a specific place.