I think I get it, now.
I don't think someone can make rape funny any more than another could make n-bomb jokes funny. Hell, even saying 'n-bomb' makes my mouth feel like it's done a wrong.
I'm so sick of this unfunny 'gordon rapes the joker' garbage, I can't possibly convey my distaste for the notion succinctly. I've studied humour. I could probably find amusement in anything and everything, and heck, even in some of this sameguy-ing repartee I'm cracking a smile, but..
The concept is cringe, the writing is cringe, the imagery is cringe, and this is coming from a guy who thinks his entire existence is a literal sick joke. Despite that, I have enough sense to say that this DC universe rape gag should've been buried before even being written.