Look at the risk of getting flamed I don't think Pep will have been happy to see Haaland stoke the fires in that way and provide extra motivation. Clearly personal rivalries are developing on the pitch (even if the managers share great mutual respect and friendship) and so I think it's safe to say matches between the 2 will from now on need to be watched from behind the sofa. Haaland seemed out of control at times and whilst no doubt City fans will love to see that, it does indicate him getting wound up and it's one thing doing that at his home stadium but he's now created a viper-pit atmosphere for the game at the Emirates. City are more than capable of handling that but why make it even tougher than it would otherwise be? It's like creating an extra trip to Anfield from a City perspective.
Likewise Arsenal's shithousery guarantees City away will from now on be even harder than it was before as the fans will be even more up for it than they were before. I'm thinking City-Madrid of a couple of years ago levels of crowd atmosphere which makes it almost mission impossible.