It's good to be passionate about things. Classical music, as has been pointed out, is such a vast field that it's unsurprising that not everyone will like the same things. Even eminent composers were often at each other's throats (I can't recall who it was who said of Wagner 'He has wonderful moments, and terrible half-hours'; one of the Italian opera composers maybe).
(With me, it's more about literature. I can quite understand someone not getting on with, say, P G Wodehouse, or James Joyce, but if someone says they can't be doing with Shakespeare, I think they're just not trying hard enough).