[googlryas]

It's not, it is just a term in common usage taken to the extreme in an attempt to be clever, in contravention of all conversational norms. I don't think there is any definition of tolerance that is mathematically sound and absolute.

It would be like saying "a peaceful person would never punch someone in the nose". But what if you needed to punch someone in the nose because they were trying to kill you for no reason? That doesn't mean peaceful people don't exist, or that peaceful people need to let random people murder them. It just means that the determination of peacefulness is contextual.