Toni Morrison’s argument about the real function of racism – which applies to equally to sexism etc – is this:
The function, the very serious function of racism is distraction. It keeps you from doing your work. It keeps you explaining, over and over again, your reason for being. Somebody says you have no language and you spend twenty years proving that you do. Somebody says your head isn’t shaped properly so you have scientists working on the fact that it is. Somebody says you have no art, so you dredge that up. Somebody says you have no kingdoms, so dredge that up. None of this is necessary. There will always be one more thing.
— Toni Morrison
There’s a related argument, originally about anti-Semites but also relevant in many other cases:
Never believe that anti-Semites are completely unaware of the absurdity of their replies. They know that their remarks are frivolous, open to challenge. But they are amusing themselves, for it is their adversary who is obliged to use words responsibly, since he believes in words. The anti-Semites have the right to play. They even like to play with discourse for, by giving ridiculous reasons, they discredit the seriousness of their interlocutors. They delight in acting in bad faith, since they seek not to persuade by sound argument but to intimidate and disconcert. If you press them too closely, they will abruptly fall silent, loftily indicating by some phrase that the time for argument is past.
— Jean-Paul Sartre
I’ve certainly experienced this when trying to argue against crazy conspiracy theories.
It is all distractions, it is all in bad faith.