To be fair to humanities types, science is hard, and it's really pretty easy to find what you wanna find in it, if you're not going off large-scale studies. Even then. Making sure the science is done well and accurately depicts what you're trying to find is hard, especially when you have limited funding. Neither empiricism nor rationalism work perfectly.
Also, Reelya, you have to remember there are like five definitions of feminism. "Believing women are people too", aka the most easily defensible version. "Allowing women to do anything that only men used to be able to do", aka the overly basic version. "Not shaming or preventing people from living outside of the typical norms and traditions of gender roles and stereotyping, and allowing them as much freedom as possible in how they live their life", aka the egalitarian version. "Hating men", aka the parody version. And "Overthrowing the patriarchy as fast and as destructively as possible, without regards to whom it may harm in the process", aka the different slice of the pie version, in which you must live your life explicitly in opposition to gender norms regardless of what you may personally desire.
But yeah almost all of this stems from tribalism/groupthink and the part of your brain that doesn't care about abstract evidence, it cares about Us vs. Them. Like how fracking really isn't that bad if the companies take appropriate safety precautions on the surface equipment. (to prevent spills, basically). It's actually rather like nuclear in that sense; it's not perfect, but it's better than some alternatives (fracking for natural gas, or coal. Which would you prefer?), and is essentially safe if the procedures are followed. It's also cheaper than nuclear(which is essentially pointless to build any new plants at this point given the time and costs required compared to the likely pricing of renewables over the next 20 years), though with a larger carbon footprint. And yet people think both are terrible and awful compared to putting the resources into renewables. Which is fair, renewables would be better, but they can't do it all yet.
I see far more about genetics vs. culture than anything else, though, but that might be because it's the field I'm interested in. *shrug*