Partially it's stuff like jerking Subban and Galchenyuk around. (See the stuff about him talking shit about them to lower their value, plus how the owner had to literally step in in PK's case.) Partially it's impatience and frustration that he took so long to get rid of Therrien - there was a real feeling that that was cronyism, putting his friend's better interests ahead of the team's. It's probably a lot of other things too but I bailed on following the Habs when things started getting weird and not-fun.