Unthinking hostility to gay people is far more entrenched among Republicans than Democrats, alas. But prejudice and fear are human things - and liberals aren't immune. Some deploy homophobia when it suits them. Take Joe Wilson on the right-wing attacks against him:
"He's had three wives, he's a womanizer, he's done drugs. But then they realized they couldn’t use those because I've never actually denied them. I mean, I'm the first to admit that, unlike Ken Mehlman and David Dreier, I really like women."
Jamie Kirchick explores this territory here. The truth is: there are tolerant Republicans who nonetheless acquiesce in their party's institutional hostility to gay people, and intolerant Democrats who never get called on their shit.