Does anyone else find it funny how he just digs that hole deeper and deeper, and is completely oblivious to it?
Being gay, or trans, is not the same as incest.
I think, though, you are either clouding the issue as to make it sound like you're educated, or you're just get off coming off as a blistering idiot.
The vast majority of incest cases is sibling incest (and father/daughter incest is probably a close second). But in those cases, it's overwhelmingly not (here's the kicker) consensual. In most cases, it's rape, or molestation and not the form of a long term relationship like you find in straight and gay marriages.
Sure, there are some cases where culturally it's more acceptable to marry cousins/2nd cousins (etc), but it's not becoming the norm, nor are incest relationships (brother/sis, sis/sis, or bro/bro) becoming accepted by godless liberals.
Either you're too gullible to fall for these simpleton scare tactics, or don't realize they're simpleton scare tactics and think you're somehow outsmarting everyone by using them.
Maybe you should do some research into things before you just say stuff to sound all folksy "and the like".
And by research, I don't mean looking up step sister porn videos.