flop and stomp his foot on the floor to make it sound worse "while taking a charge" all the time.

I just pulled him out of the game and sat him on the bench whenever he did it and explained that we weren't going to play that way. He never sold it as well as the kid in that video so usually the ref just swallowed their whistle. Finally I had to talk to his mom about telling him not to flop because he wasn't listening.