Bloke from Poole, if you believe in reincarnation (which I do), then yes, some individuals could be born "fearing and loathing homosexuality". But those people who might (note that I said might) have retained from one or more past lifes these unconscious reactions to other people's sexual orientation, still have the free will in this life to evolve beyond that fear & loathing.

In other words, it's my opinion that retaining fear & loathing of homosexuals is indeed a matter of choice, though it might be more difficult for some people to do than for others (by "virtue" of their past lives experiences and their present life experiences). Furthermore, I believe "education" does have a role to play in this, but I'm not only referring to formal education.