every discipline has some stupid people. hell, my friend hates on street skating, and his reasons make no sense, just like some street skaters' reasons don't towards other disciplines.
I think a majority of street skaters who hate on it hate it because they think its just cruising, and the things they have seen are not that impressive ie: push up slides and colemans
I skate both, doesn't leave a lot of time to get really good at one discipline, but it makes you a more rounded skater ime.
just my two cents.