To tolerate them because they do it politely, following social norms, but to not tolerate pro-Palestinian activism means you care more about politeness than violence.

That's cause they do! Well, I'm sure they don't see it that way, but to them violence is saying mean things that disturb them during their commute or besmirch the front page of the New York Times. If you do violence quietly and civilly such that they aren't forced to hear about it, you're in the clear.