Are you for real? This isn't about petty moaning. It's about the agreed laws of the game being consistently and transparently applied.
I was at that game, in the south stand where he came over to. His actions of coming over to us (rather than his own fans), gesturing numerous times (and not just the finger you obviously watched on TV) and laughing to gain a response are in direct conflict with the below FA rule
"A player must be cautioned, even if the goal is disallowed, for gesturing or acting in a provocative, derisory or inflammatory way"
On that day, I watched as the referee turned his back and chose to ignore the celebrations which lasted almost a minute.
So, that referee should have booked him but made a conscious decision to ignore the breaking of the rule and didn't book him. Then, despite the incident being mentioned in newspapers, the PGMOL chose to do nothing what so ever.
Ordinarily this could be overlooked, but this fixture has previously resulted in crowd trouble, and both sets of fans were contacted by clubs and told to be on best behavior. As a result I find it disgraceful that, one - a player then chose to do this, two - his club didn't issue a statement, three - the match officials and authorities chose to take no action or make any sort of reference to it.