It's the one I'm really struggling with. I thought it might be the dismissal as with the racism and homophobia but it was called out separately. The closest I could see, with forcing my brain into the non-stop offended space that is Rpg.net is maybe the fact that they said their dad was in the armour as though mentioning a gender was sexism?
My personal money though, especially given a different mod stepped in to scream too, is that the initial mod always screams sexism and didn't bother to check if there was any. The second is covering them.