Aren't the rules against homosexuality also old testament?You know that's Old Testament stuff, right? So maybe your argument is with Jews. You guys are like vegans. Like to stand proud and denounce meat eaters (Christians). Or maybe like non-gunowners denouncing gun ownership because they don't know anything about it.
Look, it's fine if you don't share someone's beliefs. But are they harming you because of their beliefs? Is it any different than a Christian not agreeing with homosexuality? I don't think it is.