I don't hate coaches, I just do not weigh player traits the same as most coaches do. If any coach puts the most talented roster they can on the ice, and deal out the minutes/lines in some fashion that makes some sense, I really would not disagree with that coach often. In such a case they played the cards they were dealt.
It's the other stuff that happens, where they pick favorite players, or when they start thinking hey if we were only a little tougher, or more energetic things would be going better. That stuff works in very small doses, but it's fleeting yet once it starts failing coaching usually sticks with it through that failing. It's a card that should only be played by emergency, not one you really want to play over and over again because most of the time it loses.
I do not hate management either but I find their choices, including who to hire as coach, and when they extend or fire them, to be more likely to peeve me off. What bothers me most there, they get a pass, if they build a poor roster they just fire the coach or bring in a new player, they can manufacture hope and change where coaching has limited options to do so.