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Dude, it's really not very hard: if there's a
scientific experiment which backs up some bit of knowledge, that knowledge is scientific. It's not guaranteed to be right (people make new discoveries all the time), but it's far, far more likely to be right than something without scientific backing.
Meanwhile, when you just make up some claim, and then justify it with ...
reasons (none of which are in any way supported by scientific evidence) that's not science, it's pseudoscience.
Oh, and back on the "women have higher pain tolerance" thing, I looked it up and you are absolutely right: it seemed to be true ten-ish years ago (when I must have heard it), but then they did some more studies and it turns out it's not true ... or at least people have realized that asking study respondents to rate their own pain is not a good way to get objective information, and that they need to do some studies with MRIs or whatever to really find out the answer.
So hey, there's a perfect example of scientific evidence suggesting something is right, then more/better evidence coming along to challenge it. But that whole process is still a million times better than just having a bunch of idiots arguing over their own biased opinions without a shred of evidence to support them.