I (49M) am getting remarried to my fiancee (41F) in a month and the wedding preparations have gone well except for one issue. My fiancee's family is mostly conservative and thus not very supportive of same sex relationships and my fiancee's siblings plan to bring their children at our wedding and they obviously wouldn't want their kids to witness a gay couple at our wedding so then they'd need to explain the situation to them, so we decided to disinvite my son's (21M) partner (in his 20sM) from our wedding so we could avoid such issues.

I thought my son would be mature about it and understand our side, but instead he kicked up a huge fuss about it, saying that I'm acting homophobic and embarrassed by him and that if his boyfriend can't attend the wedding then he won't either. I feel like he's being really unreasonable, especially cause him and his boyfriend haven't even been together for that long, so it's not like he's really entitled to be invited at any family events yet and my fiancee does take my side, however my son is vehement that I'm an asshole and even got his mom to essentially gang up on me about this issue.

AITA ?