If you can prove it was harassment and not someone just saying something the other party didn’t like in a place both parties had a right to be.

If we’re both at a bar we have a right to be at, and you keep saying you think I’m a jerk and should get kicked out - is that harassment?

If you follow me there every time I go? Probably. If you don’t, probably not.

Proving one way or another can be difficult.

Oh, I somehow misread the above comment entirely and took it to mean that these rules had to be in place before we can prosecute anyone for breaking them. Not sure how that happened