Somebody has recommended you street epistemology already. An important part of it is to talk using the same concepts.
I say this because my understanding of the red pill comes from the documentary The Red Pill. It roughly means that you are aware of the issues men face in modern societies and care about them. That caring about men’s rights does not mean that you hate women.
And because of that I initially thought that trying to convince someone that “red pill mentality is stupid” was the stupid thing.