A few years back. Us against Chelsea. Sergio's away on the left wing, the ball is well past Luiz, Luiz just barges him over. Not only was it not a red card, it wasn't even a free kick. Sure, you can say it's a shoulder charge, but neither of them have got the ball. I have to presume that the ref simply interpreted it as a collision, which can happen on any part of the pitch.
I really do bend over backwards not to have blue tinted specs in general. But watching that penalty incident again and again and again, at no point does the Newcastle player have the ball. He doesn't have the ball, he doesn't have control of it, at any point. It's a collision. Furthermore, the Newcastle player mainly trips over Ederson's arm, which he could have easily skipped over. Ederson does not go in legs first. That would be cleaning the player out. It could have been given, but it's not shocking that it wasn't, either by the ref or by VAR.