Is it right that cops come and piss us off for just skateboarding at the school?:
Firstly, Cops (nor anyone else) do not piss you off. You choose to be. If you choose not to be pissed off, then you won't be. It's called a Victim mentality. You own your emotions, no one else.

Secondly, since I am a cop I can say this much… I remove skaters from areas that are posted with no skateboarding signs, where vandalism is a common occurrence or where there are trespass warnings (both the kind you see and the kind you never knew). I do not, nor do I know any other officers, that set out to “piss” people off. It is merely enforcing the laws that are applied upon them. You may not be a problem, but the two dozen other skateboarders before you might have been.