I think it's more than that, it all just feels so forced and fake, like most other aspects of that circus of a club.They don’t score many that’s why!
Like I said, I really do think they're instructed to always perform over the top wild goal celebrations, perhaps for the benefit of the cameras and highlight reels or perhaps they believe it gives them some kind of psychological advantage and has a demoralising effect on the opposition.
Whatever the reason it is a very cringeworthy and small time thing to do.