I'm going to ride my bike on the sidewalk and flip off pedestrians who are standing right in the middle
Why would you want to ride your bike on the sidewalk?
Yes, I can't let people disrespect me like that.
The sidewalk is for pedestrians. You're the one in their way, I'm afraid.
I can be on the sidewalk if I want. Why are people such fucking assholes in LA?
It sounds like you are being the asshole by riding on the sidewalk. You need to follow traffic laws and ride where you are supposed to.