Jose Mourinho wasn't happy and I can understand why Arsenal's penalty will split opinion.
Alexandre Lacazette got his shot away — a poorly executed attempt it was, too — and then came the contact from Davinson Sanchez.
The defender was trying to block the ball but the way he flew through Lacazette forced referee Michael Oliver into making his decision.
Mourinho complained afterwards that VAR Paul Tierney 'confirmed the wrong decision'. Once this was given in real time, there was no way Tierney was going to overturn it.
The contact was clearly there, and this was not a clear and obvious error from Oliver. Later in the game, there was a robust challenge from Harry Kane on Gabriel but the Spurs striker did not lead with his elbow or forearm, so that's why he wasn't red-carded.
I would have shown him a yellow for it, given it was a reckless action.