This are unambiguous when you are interacting with people before you have established your own norms. It's possible for a healthy team to have a dynamic where cursing out bad code is completely acceptable, while cursing a person is not. The camaraderie built around breaking a social norm (cursing) can offset shock at violating the norm. However, that should change or be re-evaluated every time that norm is disturbed.

It's also possible to go 'too polite', to the point where criticism goes unsaid because you don't want to offend. That's just as toxic of a culture, it just leads to a much slower demise than the flame-outs you get from more visceral bad behaviors.