I don't think anyone would deny that the cops practically invite so-inclined people to act this way.
Just going from the vids I've been seeing, they seem to be wanting to taunt the cops with knowledge about the court decisions. I agree it should be legal, but in a sense it inhibits reform as well. Intentional taunting doesn't help get change enacted and leads to people sympathizing with cops.
I think Primemuscle and Beach are way off though. Nobody should ever have to be in fear of reprisal - from a cop nonetheless - for exercising free speech.
Guess nobody should criticize radical Islam as well. Never know what one of those psychos will do.