Racist is not okay in anysense we all agree on that. I just think its was used in this particular situation to moan with the referee trying to get advantage out of it.
I mean if the player is really insulted by that surely he would have got to the player directly instead of running to the referee.
Again not saying its ok, but Im sure there's plenty of racism towards asians, latins, and all other minorities and still you dont see those players complaining as much.
Most teams have multiple races in the squad, I highly doubt some of those players who share a pitch with their black team mates is genuinely a racist without that being a massive problem in the squad. Its a mental trick, trying to get into your opponents head, but hey we are living in a fragil world today Im sure many will say that its not valid.