it might be that one annoys the bejesus out of the other
it's not the same situation but - my stepdad always wanted to go with my mum to be Supportive and she wished he would stay the feck at home cos he always asked really stupid questions and wasted the alloted time
really stupid questions like about how the exam system worked etc and she would be fuming
so maybe if you've ditched the eejit cos he's dim as can be, you don't want him messing up your quality teacher time