He should just say he's reclaiming the slurs. It might make him feel better, but it's even more likely to trigger the other troons and that's always fun.
Those other gays should disinvite the gay who thought it was a good idea inviting a pre-everything troon to a gay sex party. A bunch of men looking to hook up, and then this fag brings a woman calling herself Brendyn along and expects everyone to want to fuck her? He either wants to fuck her himself or he's got woke-blinders on and is going to be all offended this his gay friends aren't attracted to an obvious woman, and either way that should get him banned from any future events.
Though what if the gay guy has been getting creeped on by the fujoshi troon for months on end, and desperately wanted her to fuck off and leave him alone? So he invites her to an all-actual-male sex party, and when she doesn't get the hint and starts drinking and won't stop bothering him even there, he pushes her to try and take part, either just so she'll leave him alone - or even better, knowing she'll get rejected and just stop bothering him forever. So he did set her up to fail, but he gets to look like the progressive hero.
It's very likely her being paranoid and delusional, sadly, but it's certainly more interesting than a troon not getting validated for barging into a space they're not welcome in for the millionth time.