You can’t really force people not to be homophobic. You can stop them from presenting their reactionary views, explain why they are wrong, but if they are a stubborn homophobe you will just have to let them be. I don’t tolerate homophobic people, I would not associate myself with homophobic people. The difference is that you should do everything you can do to prevent them from being homophobic and spreading their shitty bigotry but there is only so much you can do.