Arsenal fans have a number of reasons to laugh at Chelsea right now. The Gunners welcomed the Blues to the Emirates Stadium on Tuesday night, and Mikel Arteta taught them a footballing lesson. Arsenal smashed five past Chelsea and could’ve, and probably should’ve, scored five more. It was a truly dominant performance by Arteta’s men, and we are currently 30 points ahead of Mauricio Pochettino’s billion-pound blues. As Arsenal fans, we absolutely love that, but what made us laugh was something Chelsea‘s official X (Twitter) handle did during the game. What Chelsea did on Twitter as Arsenal beat…