I hate riding on the sidewalk. It's pretty scary, but there are some parts of L.A. where I fear for my life on the street so i'll take a little sidewalk detour. It's not illegal in most places around here as long as you're not being dangerous to pedestrians, so I don't mind doing it if I feel the need, but mostly I do ride on the road.
On a related note, I never could understand why people let other people get to them. I learned long ago (mostly due to L.A. traffic) that sometimes, you just gotta let things go. There will always be people that are doing something you won't agree with, getting angry about it won't change it.