I don't remember seeing this clip earlier, but I can add some background information to it.
This guy is
Paul de Leeuw, Dutch 'comedian'.
This clip is a kind of follow-up on an earlier show in which he 'slaughtered' this same kid in front of a studio audience (and live broadcast). The kid came on the show to sing the same song and De Leeuw had the original artist
Gordon in the studio as well. Obviously, this kid can't sing very well and De Leeuw ridiculed him beyond relief. A lot of outrage (sincere and less sincere) followed this show.
I guess this clip was made to show everybody that 'things were alright between De Leeuw and the kid'. It's, indeed, highly disgusting.