@Sparks
It was accurate. A poor summation, but it did reveal a major plot point. Like, try taking End Game and summing it up in a single poor sentence. That's what this commentator was doing.
It was super shitty. And yes, clearly blatantly malicious. Probably some kid who thought they were being funny.
As for Gany's question: y'all debate sports at length on the board here. People do it in YT comments on highlight videos. 
The comment threads on some of the channels I follow on YT are quite all right. One of my favorite mash up artists usually has some pretty great comments, even. It's really the viral videos that have the super shitty comments. Wherever they'll get the most eyes, ofc.