The video is a badly greenscreened-in Spiderman atop a compilation of videos of Loki while he is speaking to different heroes and smirking. A theme quickly becomes apparent because each video has Loki telling heroes at his mercy to kneel. During all of this, Spiderman is saying, "You know when Loki thinks he has you beat because he just keeps telling people to kneel to him. Fuckin mint."
The video blows up, but not in the way he thought it would. All of the comments just keep telling Spidey to stop kink-shaming.