How did they even know he was gay? I bet he did not tell them his sexual orientation. I am sure they just assumed they knew what it was from his mannerisms and possible lisp. I hope the bigots get outed, and banned from ever eating at any Carrabbas ever again.
Then again, having worked for a restaurant, I can't help but assuming these pricks are probably dead beats who were looking for any excuse not to tip, so they turned to Jesus.