Speech proscriptions can be overt with legal ramifications.
Or they can be sort of covert, couched in ideas like good manners, respect, make no waves, maintain friendly relations, follow group norms, etc.
I believe the covert ones happen most basically because almost all people are terrible at speaking about their own subjective truths. And this leads to being terrible at hearing others’ subjective truths, even if they are well-expressed which is rare.
This problem arises from the pervasive, inherent ambiguity of language in general but especially spoken language.
Speech flies by and we are required to extract coherent meaning from bits of it. We make stories out of it and judge people, including ourselves, based on bad evidence.
Ambiguity in speech also requires us to maintain the same personas and most of the same beliefs for decades. We travel in herds of ideological banality due to it.
Staying the same is a way of projecting sort of unambiguous meaning even though we all know that deep down the whole thing is a bad game.
I used to be bothered by this, but stopped after I figured out FIML and practiced it with my partner for a few years.
After maybe five years, our speech started to become so much clearer it didn’t even feel like the same medium anymore. After ten years, it got so good it seems we may have transcended psychology as it is normally conceived.
This happened because psychology as normally conceived is massively based on speech ambiguity and the ways people react to it. Fact is, you probably should feel a bit crazy in most interpersonal situations because speech proscriptions mixed with compounding ambiguities cannot possibly allow the psychological freedom needed to be cognitively healthy.