Interesting sub point: some of the most die hard of flat Earth conspiracy theorist actually claim that mathematics are an invention of the elite to control the masses. You can't convince them of anything with math because they don't think math is true.

And Bertrand Russell's masterwork is not going to help, unfortunately. As convincing an explanation as it is for the basic principles of mathematics, it's a dense slog. Fascinating but very time consuming to work through and comprehend.