i worked with a guy who was a proven bully, lazy, made serious errors of judgment….but boy did he know how to play the system. Initially he would try to intimidate any manager that pulled him up, if that failed would lie, and if that failed he would cry and claim MH affected. The managers would always back off.Towards the end of my working career this was becoming a very real issue.....Group CEO went very public with a big initiative on how colleagues needed to be supported when suffering MH issues etc, which unfortunately resulted in 'MH issues' being used as a defence mechanism/excuse left right and centre. Examples such as picking someone up for a poor piece of work/underperformance................next thing would be a formal complaint to the next level up along the lines of 'my manager is having a negative impact on my MH by being critical of my work.....the CEO has expressly said we need to support staff' etc etc.
No, you just aren't doing your job well enough.