What served as more of an annoyance, however, was more that Costa himself managed to evade sanction from the match officials despite also seemingly having deserved to be sent from the field of play.
That was certainly the opinion of Arsene Wenger and countless people - Arsenal fans and neutrals alike - watching events unfold at Stamford Bridge. However, Jose Mourinho defended his player as Jose Mourinho always does.
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While Costa may have emerged as public enemy No.1, he does still have some notable supporters - not just Mourinho - with Gary Neville admitting he is also a fan of the tempestuous striker.
Following Chelsea’s 2-0 triumph against Arsenal and the subsequent dissection that followed, Neville tweeted that he likes Costa. Cue a barrage of insults for the former Manchester United captain from angry Arsenal fans.
Suffice to say that Gunners were far from pleased with Neville’s tweet, particularly given how raw they would still have been feeling from the result and the apparent injustice that had just played out in west London.
Neville himself was known to be something of a wind-up merchant himself during his Manchester United days, so it is little wonder he admires someone who plays the game in a similar spirit.
Diego Costa - hero or villain? Let us know below!