What evidence do you have that women, as a group, are more likely to over-report pain?

I have absolutely 0 evidence for that because I never made that claim at all. That would an incredibly dumb claim to make. You're arguing in bad faith on behalf of a divisive culture war and putting words in mouth.

You accuse the Guardian of engaging in gender war clickbait

I accuse the Guardian of engaging in click bait in general. That's a significant portion of their business model.

denying the findings of a scientific study?

This post is not the findings of a scientific study. It's a headline ans an entertainment article which is vaguely referencing an actual scientific study in an actual academic journal. That paper is titled "Global and regional reference curves for pain across the lifespan in 6.1 million individuals in 118 countries", not "Womrn Suffer More Pain Than Men..."

Doesn’t seem scientific to me.

I never made any claims as to the "scientific" quality of this, and i'm really confused as to why you are suddenly focusing so hard on the word "science". FYI- tossing the word "science" around is usually not very effective at convincing people you are right.

Out of curiosity, would you also say this about a study with men and social isolation (another entirely self reported metric)

This is an oddly phrased question but I'll try to read between the lines at what you're getting at here. "loneliness" is a far more abstract concept to even try to measure, so any results will be even more subject to the limitations of surveys than pain. It would be far more accurate to state "X group reports loneliness at a higher rate than Y group" rather than staying "X group experiences more loneliness than Y". The whole point i'm making is that the word "experiences" is different from the word "reports".

"Male loneliness" is just "loneliness" with more gender war spin applied to it. Loneliness is reportedly increasing across all genders, age groups, and pretty much any other way you slice it in countries with broad access to the internet.

paul wasn't saying they definitely feel less pain than they report; he was saying that this study can only measure their reported pain, not their actual pain. He does not need to give you the specific disproof you are looking for because he is not claiming the study's conclusion is definitely false, just that its methodology is not sufficient to prove its conclusion.