Sam Dean in the Telegraph has written a very good piece about the incident. It's quite long, this is some of it:
This is the season of Premier League aggro, where cheats prosper
Here are two depressing lessons from the past few weeks of Premier League action: play-acting works, and deliberately needling your opponent could lead to significant benefits for your team.
This is becoming the season of provocation in the English top flight, where dishonesty is being routinely rewarded. The latest example came on Sunday, when Brentford’s Igor Thiago was shown a red card for “violent conduct” after a collision with Brighton midfielder Chema Andrés.
A recap of events: Andrés grips Thiago’s shirt while the Brentford forward has the ball, and then shoves Thiago in the chest. Thiago responds by brushing off Andrés with his arms. In doing so, one arm inadvertently makes contact with the Spaniard’s face. Andrés, unlike Thiago, uses this contact as an excuse to collapse to the turf in pretend agony. Thiago is shown a red card.
Thiago’s manager Keith Andrews felt aggrieved at his striker’s sending-off; it continued a pattern we have seen throughout this season, when the reaction of a provoked player has often been treated as a far more serious crime than the original action itself.
There was also a red card for another Brentford player, Yehor Yarmolyuk, in their recent game against Liverpool. On that occasion, Liverpool defender Jérémy Jacquet deliberately provoked Yarmolyuk by walking directly into him while the ball was out of play. When Yarmolyuk responded by nudging Jacquet with his chest, he also made slight contact with his forehead. Down went Jacquet, crumpled on the ground as if punched by Anthony Joshua, and out came the red card. By the laws of the game, it was the correct decision. But how grim it is for the sport that this is the case.
The blunt truth of the matter is this: the sight of a fully grown professional athlete writhing on the floor at the slightest contact is usually far more of a blight on the sport, and far more damaging to football’s reputation, than the supposedly “violent” act which triggered such a reaction. Viewers across the world will undoubtedly have been more offended by Andrés’s actions on Sunday than by Thiago’s, and yet it is the Brentford forward who will miss three matches. Deception and deviousness, it seems, have become necessary attributes in the modern game.