Not sure what I think about this. I mean, of course I think they're a bunch of horrible people doing this, of course I think they SHOULDN'T be doing it, but should it be ILLEGAL for them to do it? I think that would be a slippery slope that I'm not sure I want to start down. Maybe that's just me.
However, I will also say that if the current "hate crime" laws don't address this, then they shouldn't apply to ANY case. I understand that currently if a preacher reads Lev. 18:22 to their congregation (for instance) they could get brought up on hate crime charges. If that IS true (man, I don't know, I'm just a guy sitting here) then surely these people should have been given the chair by the same measure.
However however, I don't think think either should be illegal. Frown upon it, shun the people, boycott their businesses, don't send them Christmas cards, whatever you want to do, but I don't think it should be prosecuted as a crime.
One more note, I believe in a just God who is looking down on these people, and at judgment day I rest assured that He will deal with them as He sees fit in His righteousness. Vengeance is the Lord's.