What are some silly little things, related to music, that irk you? It might be the way a certain drummer holds his stick....or the fact that Mark Knopfler doesnt use a pick to play. Might be the way bono ad libs lyrics at times (that actually does irk me haha).
This is just mean as a bit of fun.
I will start the ball rolling with........I really dont like Bass guitars with more than 4 strings. All my most fave music acts, all have bassists who use 4 strings haha