My wedding was supposed to be the most beautiful day of my life, so I asked my brother to not bring his husband to my wedding.
Such a mean request. Why don't you want him at the wedding?
Because they're gay and I just don't want them to be there.
If they had done something to upset you I would understand but you're not inviting them because they're gay? That's extremely rude and homophobic of you. Don't discriminate against people because of their sexual orientation.
I'll do it anyway, it's not like you're paying for it.
You shouldn't exclude your brother just because he's married to a man. You're brother will never feel accepted by you unless you can accept his husband too. Why don't you let them come to the wedding so you can all enjoy the day together.