I hate it, yet if I am going across a metal bridge in the rain I will hop up on the walk, if its crowded I just walk my bike.
I feel like I should but it seems like it would be wasted breath.
As far as the a-hole responces you get, that should almost be expected because mostly a-holes ride on the sidewalk when they shouldn't be.
On that note, I have a friend that got ticketed for coasting on his bike up to a bike rack near 2nd city. Now that was some BS. Especially when the officer could have ticketed the multitude of motorists on their phones while driving in that area.