For those who don't know, the "women are wonderful effect" describes how women have an in-group bias toward their own gender, while men have an out-group bias in women's favor.

I picked up on this when I was a kid 30 years ago, and everything I've witnessed since then has proven me right. Don't take my word for it though - it's an objective reality:

https://rutgerssocialcognitionlab.weebly.com/uploads/1/3/9/7/13979590/rudmangoodwin2004jpsp.pdf

It's easy to observe in day to day life. The vast majority of men fall into one of two categories - on one hand, you have self-flagellating male feminist types who demand we "believe women" on any claim of sexual misconduct, support special scholarships, admissions standards and business grants for women, and will discuss their gender as if it were the scourge of humanity. On the other, you have tradcucks who advocate treating women effectively as royalty, even if they don't know them, from small things like serving them first at restaurants up to and including giving their lives for them in hazardous situations.

I am inclined to lean more toward the social conditioning side for a few reasons. Like most men, my mother tried to drill into me to treat women as my superior (in the tradcuck fashion, despite her being a staunch Democrat). Somehow I didn't fall for it but rather fought it at every turn, yet I noticed that I was nearly alone in this regard. For a while I was wondering if I'm just missing some genetic predisposition to gendered masochism that most other men have that makes them not only take pride in being subservient to women without a second thought and actively shame other men who don't.

However, the "nature" idea seems to hold less water when you look across the world at places where women are treated like dog shit, such as much of the Middle East and North Africa. If men had some genetic protective/deferential instinct toward women, one would expect it to manifest itself similarly across all cultures. From what I know the tradcuck version is prominent in Latin America and Sub-Saharan Africa, but this is most likely due to European colonial influence (where the concept of chivalry originated among knights - hence the term "white knight"). The misandrist type is largely nonexistent in these parts of the world, but that is bound to change someday as women obtain more rights and form a backlash (like we have seen in the west).

It's fairly obvious why women would develop an ingroup bias - lacking the physical strength of men, it makes sense that they would need to band together to survive. It also follows why women would brainwash their sons (and other men) into this same mindset for their own benefit. That being said, I'm curious if there's something genetic that makes men receptive to this conditioning, and in parts of the world where Islam dominates (as the inherent sexism in Islam hasn't been neutered over the last few centuries like that in Christianity has), the opposite form of brainwashing (that women are effectively subhuman) suppresses the natural "women are wonderful" inclination.