I have no idea what the allegations are in this specific case, but it strikes me that there's a fine line between strong management, which I believe is needed, and bullying, which so often seems to be someone hearing a few home truths.
https://www.bbc.co.uk/sport/football/46729011
https://www.bbc.co.uk/sport/football/46746980
https://www.bbc.co.uk/sport/football/46729011
https://www.bbc.co.uk/sport/football/46746980