The fact that he blew up on me making a joke in the manner that he did. It was incredibly silly and funny to see him go out of his way to explain how porn wasn't an essential part of the MLP community (obviously) and try to protect the honor/explain why porn isn't why people tune in to MLP. Every time anyone has anything to say about MLP, he'll immediately jump on the opportunity to defend thy princess to try to turn their negative way of thinking of his hobby rather then say "that's life" and carry on. He has to explain why he loves MLP, go into details and literally go into paragraph upon paragraph of discussion when all he simply has to do is either laugh or say "oh, well that's okay". It's like he's the good white knight of MLP that feels it's his royal, sacred duty to protect the dignity of MLP, which I find quite hilarious and a little bit on the depressing side. :V
Cause I've been on the internet long enough to know how discussions on the topic goes.
Two ways the conversation could have gone-
1)Person 1 says <x> has porn of it -> Person 2 admits that yes there is porn, but not everyone is into it -> Person 1 or in this case probably some random poster smelling the immenient shitstorm posts something along the lines of "ermagad they admitted that
some people like porn. That must mean everyone into <x> fanbase is manchildren/perverts/cancer on the internet destroying the world"
2)Person 1 says <x> has porn of it -> Person 2 downplays the porn -> Person 1 calls person 2 a white knight.
Personally if I have a choice in a conversation, I would rather something think of me as what you posted rather than someone smelling the conflict without fail starting a slapfight by posting annectdotal evidence to try and prove their point burning the thread into the ground and eventually getting it locked while at the same time claiming the opposing party was at fault. I should know; I'm the lvl 100 destroyer of threads.
Tl:dr; I smelled a shitstorm a brewing and immediately put out the fire.