Things to be added besides politics and religion that set people off: opinions on music! Hey, I like what I like and you like what you like, and that is the way it is and the way it always will be.
Anyway, I think I've probably wished someone to go to hell because they liked a band that I can't stand, and yes, I think I did once break up with a girlfriend in part because she liked the Barenaked Ladies, who weren't bad even if they are a bit middle-of-the-road (Gordon and Maroon were fine albums)!