No actually it does, see it refers to severe mental illness and madness as the quote from the good people of Merriam-Webster attests.
Insanity, craziness or madness is a spectrum of behaviors characterized by certain abnormal mental or behavioral patterns. Like killing 20 children, or participating in a mass cult suicide.
You are insisting that a word doesn't mean what it's definition says it means.
If I were using the term colloquially, I would say our conversation is insane. Then you'd have a point.
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