From the sound of it, Flores, like a lot of guys from the Belichick barren coaching tree, can't seem to figure out the mix.
Belichick isn't really overtly nasty, rude or a jerk to his players any more than any other coach. Sure, he's gruff and grumpy and short sometimes, but he doesn't act like a total ass the way a lot of his assistants who get jobs as HC seem to. IMO they are trying to imitate him and in doing so go overboard.
With Bill, it's work, followed by work, with some more work. No time for goofing around, laughing, or feeling joy. But you don't hear stories about him disparaging players.
Mostly guys complain that nothing is ever good enough in NE for Bill and his staff.