Very strange refereeing incident

This strange incident happened in a Qatari cup about two weeks ago between Al-Sadd and Sailiyah when the ref decided that the striker did an unsporting play by making fun of opponent while scoring a goal.
Goal disallowed and player was given red card (second yellow)!!!!!!

I have checked if such an incident can deserve a yellow card, might be according to refereeing rules:

"unsporting behavior" - this includes hard fouls; holding an opponent or deliberately handling the ball for the purpose of preventing an opponent from gaining possession of the ball; faking an injury; saying things that are designed to confuse or distract an opponent; harassment (such as jumping around, shouting or making gestures to intentionally distract an opponent; jumping in front of a corner kick, free kick or throw-in; worrying the goalkeeper or trying to prevent him from putting the ball into play; & adopting a threatening posture), gaining an unfair advantage by leaning on, climbing on the back of, or holding a teammate or the goal; blatant cases of holding and pulling an opposing player or his uniform; any action designed to deceive the Referee; and behavior which in the Referee's judgment is unsporting or causes an unfair advantage"

May be the yellow card is deserved, but I don't see the reason to disallow the goal.