Arsenal boss Arsene Wenger fumed at Diego Costa following his antics in Chelsea's 2-0 win over the Gunners at Stamford Bridge on Saturday.
Costa was involved in an altercation with Gabriel just before half-time of the game on Saturday, which resulted in the Gunners defender receiving his marching orders.
Arsenal had Santi Cazorla sent off in the second half as well, but Wenger believes Costa should also have seen red during the game.
"A big one yes because Costa's is a red card and I wouldn't like to be Mike Dean tonight because I can't understand the situation – how he dealt with it," the Frenchman said when asked if there was a sense of injustice after the game.
"Costa twice should have been sent off with Laurent Koscielny. Look at the situation before the cross, he hits him in the face on purpose and then makes a fuss. In every game he has aggravation and gets away with it.
"We are guilty because we gave in on that and responded to it. We knew it before the game and when someone touches him he goes down like he has been killed.
"[Gabriel] shouldn't have responded but still the two sendings off and Costa staying is a shame."