Chelsea is in the state that I described above. We saw it when they drew with Manchester city 4 : 4, the celebrated like they won and their subsequent matches were disaster. Last week, Manchester United drew with Liverpool and celebrated as if they won the league. Something is wrong.
United were obviously the happier of the two teams, Liverpool dominated the game and they felt unhappy that they couldn't get the three points. I know that United is a big team and you don't expect them to be parking the bus, but what do you expect from Ten Hag, if he came into that game with the mind to attack, they would have lost heavily. He gave Liverpool all the respect in the world, sat back and got a point for all his troubles, and though they were happy, they weren't celebrating the way you put it.
I think about Chelsea success in holding Manchester City to a 4-4 draw and then, Manchester United success in holding Liverpool to a 0-0 draw. I think it's natural for Chelsea and Manchester United to celebrate these results, no matter whether they celebrate like winning a tournament or just an ordinary celebration.
Because after all, considering the situation and condition of Chelsea and Manchester United at this moment, which can certainly lose but ya, in fact Chelsea and Manchester United managed to hold a draw against the seeded team like that. So ya, with their success in not being defeated by Liverpool and Manchester City then yes, I think their happiness is natural to happen.