I agree with you that people should not be able to discriminate because of someones chosen political views. There was a case at my college were a lady working in admissions made some statements at a KKK rally. The university was going to fire her and such. However she was never fired because they could not prove that she ever did anything wrong at work.
I believe that two or more consenting adults have the right to do whatever they want in the privacy of their own home. You have the right to think what they are doing is wrong, sinful, etc. However, this does not allow you to beat the crap out of two men or woman kissing because you don't like it. And yes that has happened.
White people get beat up for entering minority neighborhoods all the time. Sometimes the victims are blamed (just watch Cops) when they are asked "what were you doing over here?"
It is wrong to paint everyone who opposes homosexuality as being gay bashers guilty of assault or condoning violence.