is both negative and vague. Usually people use it as shorthand for someone who behaves in a manner that sane persons don't, or one who believes things that are obviously contrafactual.
It is not a medical diagnosis.
Of course "crazy" people have rights.
But I have the right to not agree with people who are or might be considered "crazy"
"Two things are infinite: the universe and human stupidity; and I'm not sure about the the universe."-- Albert Einstein
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