A few thoughts.
'One just knows, darling' would be waspish, camp, rather funny. It conjures an image of someone playing at being an aesthete a la Oscar Wilde.
'One just knows' said seriously, is insufferably twatty. The only reason for saying that is to condescend. The statement is 'I have taste, you do not'. It is divisive, portraying a 'U vs non-U' or 'officers vs men' mentality - and one that suggests 'knowing' and 'no knowing' are innate characteristics, a sense of taste and style that one is born with, not something that can be learned.
Yet, that was a very specific bit of 'knowledge' he imparted. it wasn't just a general comment on taste and value. He must have an idea why he thinks that and where he obtained that knowledge. Or, be able to say 'oh, I can't remember but I was defnitely taught that was true'. That places the source of the knowledge outside him and you could agree to look it up, without threatening his ego.
My experience is that the brightest people and best leaders, in the workplace, are the people most able to admit they don't know and to discuss ideas openly, genuinely inviting comment from others. These people are very confident in their own abilities and knowledge, with good reason, but they retain a sense of curiosity. They are always willing to learn - and assume others are interested in learning and exploring new ideas too. It wouldn't occur to them that someone else having an idea, or knowledge they lack, would reflect badly on them. Rather, it might interest them and moves the group's knowledge or problem-solving ability forward.
The worst people to work with are defensive people. Anyone who is defensive, snappy and closed about their knowledge and their work is telling you that they are fundamentally not confident in themselves and are terrified of their incompetence being exposed. (Well, occasionally defensive people are controlling psychos who want to prove they are right about everything but that type is rarer).
It sounds as if your DH's self-doubt prompts defensiveness, which makes him a closed communicator and probably an authoritarian leader. One who issues orders without good explanations, moreso without asking questions or listening to anyone else. Therefore who everyone else sees as having a narrow, limited awareness of what is going on, so chooses to ignore or work around.
If that's the case, he needs to learn some good mangament techniques, for involving his team, gathering ideas, communicating and making people feel involved and valued.
The irony is that the more open he his, in a structured way, the more people will respect him. The more he strides around 'demanding respect' the less he wil accrue.