I would not treat a homosexual any differently than I would treat a heterosexual.
My mom had around three husbands, where divorce is comparable to adultery in the bible. One of the commandments warns against adultery. Yet I don't treat my mom badly based on that adultery. I see homosexuality in the same way.
And why did Christians treat Charles Manson differently? He never murdered anyone himself, just like Christians...
It is not just a "sin," it's a "choice." If you are comfortable around sin and perversion that you see no difference, therein lies the problem.