Teachers/students who laugh and 'guffaw' when you mention the Beatles or something. Who cares, they didn't have 40 years of classical training, they went and did their own thing... I'm mentioning them, calm down!
Generally, people who will sit you down and pretty much force you to listen to something that they love, but refuse to listen to something you want to show them. Generally, Jazz musicians will post tons of videos on my facebook, and BUG me to death about what I drew from it, what I liked, etc. If I post a piece, they instantly criticize it, as if they knew the composer personally and were aware that is was a weak piece. I can't stand that!
Musicians who are close minded are jackasses in general. If one is open to discussion, then it becomes really interesting working with them. If they are instantly saying that it's bad either because they haven't heard of it, or because the group/artist may have won a grammy, then these people are snobs to the max.
Musicians who don't care to do some research on a piece/composer/artist. There are some artists today who produce really good music, and they have a really interesting story. As soon as it gets radio time (even CBC!!!), it's labelled 'mainstream', therefore it is crap, QED. There is obviously some music on the radio I don't really like, but I don't go out of my way to sh!t on everyone who likes that music. If you do that then you are just a rotten person who is unhappy in general.
In the last year, I've seen more people like this than I needed to, so I have a lot of rant-oriented posts recently. Also, people who take stabs at you for one comment/thread you post. They don't know your background, they take things out of context, they leave vague remarks, and are probably just looking for a way to prove someone wrong. When it comes to 'difficulty' of a piece, there is no proving right or wrong, unless you can provide a proof of some sort. In music, it is never that simple; this is why we offer SUGGESTIONS and OPINIONS, not DEFINITIVE ANSWERS to vague/subjective questions.
Damn.