Probably that moment he realized he liked guys. That's my guess. I had an epiphany point where I realized women were the most enticing creatures I had ever seen. I suspect that it was likely the same for him, just with guys in place of women...
What made you ask me, specifically, this particular question?
She has a problem with anyone being gay who isn't also super liberal. Messes up the liberal narrative, and thus she (Althea) can't stand it.