Reacting angrily when subbed off is common among big players, Ronaldo have done it, Messi too have done and so many star players so Osimhen case is just being exaggerated.
Compared to Ballotelli and the above mentioned players i don’t think Osimhen is as disrespectful as any of them and that was why Chelsea didn’t hesitated when trying to bring him to Stamford Bridge, his anger is a controllable one.
I agree with you. Osimhen is not a footballer with an extremely bad behavior. He is a good professional. After the Bologna game where Osimhen missed a penalty, the club's official social media account posted a video mocking Osimhen. I think that's the knot and the starting point of the problems. Osimhen was offended by that post and nothing was ever the same again. The best thing for Osimhen is not to play for Napoli anymore. I'm sure he will be very happy at Galatasaray and he will give a unique performance. And after one season at Galatasaray, he can play for Chelsea or Paris Saint Germain.