He can, but maybe he thinks Martial is the kind of guy who would appreciate a public pat on the back from his teammates too. What harm has it done? Seems a daft thing to get wound up by in my opinion.
It did no harm, but it's annoying to see our players listing fans chants after a game we conceded the equalizer in 97th min and are in 9th spot with 7 points away from 4th. If I were player, I would be severely depressed by the result far more than any fan.