At what point does what you call "personal preference" become what others call "snobbery"?

I read the question earlier, and tried to figure out what I thought, because it's not just music. When does not wanting to date people because they look a certain way, are from certain a place, like things you don't like, become snobbery? When does preferring wine to beer, or silk to polyester become snobbery? We all have things we like better than other things.

I think "musical snobbery" is when a person's dislike of certain music use it as license to ridicule other people for what they prefer. To belittle them or their music. To bitch, whine, piss, and moan about it. It's an enormous turn-off. Maybe it's a way of bonding with like-minded jerks, but I hate it. I'd rather not hear about what these people don't like.

And a logical extrapolation is, if you think it's acceptable to ridicule the music someone likes, you probably ridicule all sorts of things about other people.

(The word "you" isn't aimed at anyone in particular.)