I think they are all pretty subjective but I think Havertz's tackle was far worse than Udogies. I agree with the VAR assessment that Romero's first was just petulance. I don't think either could have complained if they had got a red though. I'm loving the chaos.You can’t kick players when nowhere near the ball, it’s a red. Udogies one was just pure luck in his behalf that Sterling saw him coming otherwise he’s getting broken in half by one of the worst tackles in premier league history.
As an aside point the fact they ruled that goal out saying he interfered with play is highly amusing given some of the goals they’ve allowed this season.