I don’t see anyone kicking him. He ends up on the ground but it isn’t clear how that happened, as he was part of the action and may have been resisting people trying to move him out. Security people are trying to move him out. One guy assumed a “put up your dukes” position but clearly didn’t hit him.
This is typical, that someone says people are kicking or hitting someone while they are down and the media runs with that, and does anyone really watch what happened?
That said, anyone trying to pull this crap in a crowd of thousands is asking for trouble and attempting to create a situation and be a martyr.