I hope you know that apart from Dembele, it is a disgusting and ugly tendency to spread red-cards if a player protests and says something like "you are bad".
The bureaucrats want to defend the referees, but everyone with eyes knows that the referees give that card out out mere and pure anger, which is a very bad tendency.
Very often they don't even give a yellow when the kind defender seemingly wishes to brake the legs of the attacker, there are disgustingly committed faults to almost deliberately cause injuries, but the wise referee sees through all of those, but when it comes to defend his own pride, ascendancy and authority, he punishes players who would rarely even commit a fault.
It's an awful tendency, because the game is becoming less and less clear nowadays, so the least important factor should be the referees own pride.
That's why people with too big egos shouldn't work as referees. They should fend the fragile players and not their own ego!
If I said "you are very bad" to any of the forum-users without even a microscopic cortex, people wouldn't even notice that anymore...
It's not the worst offense or personal attack, it's just an opinion, and specially so, if it is TRUE.