Why aren't we allowed to call insane people nutters on this site?

I have seen a few hidden comments with that word in them. I take it it is no longer politically correct to use that word. Am I right?

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MartinII · 70-79, M

I don't think you would be sanctioned for using the word "nutter". But there is no way of guessing whether someone is insane from what they post on a site like this. People you think are insane are probably just people you disagree with.