The reason it's not possible is because whenever a red pill man makes a claim the response will always be

"That's not true I never met a man with that opinion, it's only the losers on ppd that think that way."

But if you showed them examples on other subreddits such as r/memes or etc the response will then be

"That's not true I never met a man in real life with that opinion, it's only the losers on reddit that think that way."

But if you showed them examples of men you know

"That's not true anecdotal evidence has no meaning"

But if you showed clips of celebrities or other famous men saying red pill beliefs

"That's only sexist misogynistic men who think like that"

There is quite literally no way to prove how MANY men have red pill beliefs because the argument back will always be "They're not a REAL man".