I think they just don't respect Frank and they want everyone to know it via their lacklustre performances. They're trying to guide the supporters into resenting the manager.
Frank wants them to play on the back foot, be underdogs like Brentford, they don't dig it, and they wont like being reminded of last season's 17th position.
When he keeps referring to needing time what he's actually saying is the players are substandard, they need time to improve or he requires time to sell a lot of them and build a new team.
Of course I'm making assumptions.
Back foot?
We are very much playing front foot football, just doing a bad job of it.