How about Massachusetts passing a law banning homophobic speech since everybody knows about the free speech clause of same amendment; prohibition on Congress.
As someone else posted you seem to ignore the 14th amendment which applies the constraints of the Bill of Rights on the states as well.
I’m not ignoring anything. This subject is out for discussion.
It is interesting that you should mention banning ‘homophobic’ speech. It seems there are universities that have done just that, which is odd because one would expect a university to be a place where ideas are argued, not banned.