It's ok to sometimes not like the people playing for or running the team you are a fan of. Fans are the ones putting money in these peoples bank accounts.
When you waste years of high draft pics on players who were drafted way out of place or don't play it's fair to not be happy with the GM. When you keep said GM around and never hold him responsible for poor decision making it's fair not to be happy with the owner. When you lose almost all of your end of season games season after season it's ok to not be happy with the coach. When you play like complete garbage in your most important / prime time games and often act like a child it's fair to not be happy with a QB.
You were happy at 7-0 at 10-2 though right? Maybe remember some of that too.