I will be very honest here the English F.A. and the English referees are never ever fair in their decisions where Arsenal and Arsenal are concerned. 1) Arsine wenger was fined and banned from the dugout because he kicked a water bottle in frustration, but when the Liverpool manager Jurgen Klopp kicked a bottle also in frustration m nothing was done no fine no an either. 2) When Mike Dean is the referee in a match when Arsenal are playing, there is always plenty of controversy surrounding him. Once in a match which Arsenal played Tottenham Hotspurs, and when Tottenham Hotspurs scored a goal Mike Dean almost celebrated that goal. 3) Last year he gave the Brazilian defender Gabriel Paulista a straight red card, for not even touching Diego Costa, and we all know Diego Costa is a very dirty footballer. 4) In the 2017/2018 season Mike dean gave West Brom a penalty for the handball of Gibbs kicking the ball and hitting a arsenal defender on the arm, the hand was down, and it was not intended to be used . But later referee reported to former referee Mile Riley and admitted that he had made a mistake. The best answer would be that the F.A, did not allow Mike dean to be a referee when Arsenal play ever.