Yes, but we must recognise the difference between etiquette and ethics. Ethics are the things you must do, but courtesy is a matter of etiquette, behaviour that is optional but culturally polite.
PC culture these days raises etiquette to the level of ethics, and that's simply wrong.
While there’s no doubt that one can find cases to which this applies, I’d think that applying that broadly to the vast majority of people who are arguing in good faith would stifle debate.
Given what has been seen regarding both 4chan psychological operations and Russian intelligence operations on major message boards, I can see the vantage point where it's fair to not treat good faith as assumable.
What about in private, among a group of friends? Should the degree of correctness be uniform or proportional to the size of the audience?
It seems to me that the purpose of the ethics board is to allow a company to be left alone to get on with its private ethically-laden research. It needs to be seen to be ethically responsible and nowadays that requires ultra-political correctness because more people than ever are watching.
But this is incompatible with having actual ethics discussions which require diversity of opinion.
So there's a dilemma: trying to be ethical versus trying to be seen to be ethical.