It's the Raptormaniacs Christmas special! (Even if it has almost nothing to do with Christmas itself.)
I sometimes feel the same way as Remex. I learned a long, long time ago to never, ever read Youtube comments. On the other hand, sometimes it can be a guilty pleasure to read such comments when there are other, vastly more knowledgeable (and probably more sane) people in the vicinity (such as at Tet Zoo) who can take these trolls and turn them inside out, mash them into a pulp, mash their pulp into a pulp, then fling the remains into the far reaches of the universe where they can get devoured by some sort of extraterrestrial life form. Plus, I can feature particularly egregious offenders as Dethroning Moments of Suck on Deviant Art.
Also, I really, really wish that "birds evolving from pterosaurs" remark was just a sarcastic offhand comment, but it's not.