Just because you beleive that homosexuality is the sin that it is in no way translates to an irrational fear of homosexuals.
We all have sinful thoughts. We are all jealous, we are all covetous and we are all naturally greedy AND horny. It is how one reacts to these feelings that makes a civil society.
The fact is that not every human desire, natural or otherwise, should be championed by society as a good. The same is true about homosexual activities. They are, BY FACT, disordered and dangerous. The are also NOT of use to society as a whole. That is why we don't desire to champion them with societal blessings.