Pro-gay: There is nothing wrong with homosexuality.

Anti-gay: AIDS!

Pro-gay: AIDS is also caused by dirty needles and heterosexual sex.

Anti-gay: Gay people are more promiscuous, so they make AIDS a bigger problem.

Pro-gay: AIDS is spread mostly by straight people.

Anti-gay: Gay sex is inherently more risky than heterosexual sex.

Pro-gay: You're a bigot.

Anti-gay: You're immoral/damned.

I'm tired of seeing the same debate a thousand times. What can be done to change the dialogue?