I have a problem with your last sentence, Jason.
You do, do you?

The Mormon church also denies the priesthood to women. Are you lumping women with homosexuals?
No. I was just using it as an example. All Church's and even some fraternal organizations and clubs have rules and restrictions. Don't like the rules, don't join the club.
That it's okay to discriminate against women because the church has the right to discriminate as it sees fit?
I did not say that. But I do grant the LDS Church the right to grant or restrict membership based on its own rules and to grant or withhold priesthood based on their rules even if I do not agree with it. If I get to the point my disagreement is enough then I can chose to vote with my feet.
Gay men are allowed to hold the priesthood, if I remember correctly.
Not gay men who have sexual relations with other men. Celibate gay men yes.
So essentially the only group the church discriminates against is women.
I would be happy to grant the women the priesthood. But really, is it discrimination? One might argue that gays are more discriminated against. Women can be members, hold position, attend the temple, even do ordinance work in the temple. The church will ex you for being a practicing gay person. But they don't ex you for being a practicing woman.