I certainly don’t condone sexism and wouldn’t be happy with such nickname. I think it was totally inappropriate of him and I agree that’s offensive. But I read your original post twice and you said he apologized and also took that nickname down. I think that was enough.

I don’t think it was necessary to keep arguing with him and “insisting” (your words) on anything after he already apologized and took that name down. He possibly blocked you to stop the confrontation. He might be the nasty human being but that’s his group. He could choose who to let in and who to block. Since he is sexist, why would you even want to be in his group.

I think other posters agreed that it’s sexist. No one argues about that. It seems like people don’t see any point in arguing after person already apologized, not that they don’t find it sexist