How about "If homophobia is a disease, then it's not my fault I have it."
Turns the "it's not my fault" argument around, although the term "homophobia" is terminally flawed.
Homophobia - Irrational fear of homosexuals
These guys may be mentally disconnected, but they do know their PR.
I have never met anyone with an irrational fear of homosexuals. I have met many people who disagree with their behavior, believe it is immoral, and think they are screwed up mentally, but nobody that has a fear (rational or irrational) of them.
Or, "If homophobia is a disease, then I must have been born that way."
Either way, I like your idea.