Now, the salient question: were they charged and convicted with subversion, treason, or anything like a felony? Because that's what happen in HK.
If US kids trespassed, vandalized, assaulted the police well the US doesn't put up with either. And they are charged commensurately.
What I can tell you is the police and political class are not threatened by saying British, slavery or any other touch word from our past. You won't get a subversion conviction for that.