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What Erik ten Hag did was indeed quite appropriate for player discipline, but we also have to see that while Erik ten Hag was coaching Manchester United and at Ajax previously he had a lot of problems as a coach with players, not just with Jadon Sancho, I don't mean to defend Sancho, but I think Tenh Hag also has to lower his ego and prioritize the development of the team he handles.
Now that Manchester United is in a very bad state, I think it has quite an impact on the Chemsetry of players and coaches who are not very compatible so that there is no harmony in this squad to carry out all the instructions from Ten Hag by the players.
I find it funny how you say it's right for him to discipline and then say it's an ego thing. He clearly has his standards and anyone who can't live up to it will be left out. It's the player's problems if they were slacking and can't take criticisms from the coach or manager. I don't think Erik ten Hag should bend his rules and he should keep that disciplinarian approach.