Grew up about 10 - 15 minutes away from Dodgers Stadium and became an Angels fan because of their fan base.
Don't hate the Dodgers as a whole (don't come close to liking them either).
As a child I remember going to Dodger games and seeing their fan base harass and act aggressive to fans cheering for the other team with another set of their fan base acting all offended and victimized by others who were just joking around (not being vulgar or potty mouthed) and having fun at the game... just felt like you could never feel at ease at their games.
Also seeing the fickleness of their fan base turning on their player (Piazza, Nomo, Karros, Green, Brown to name a few) didn't help either.