In more technical terms, some spaces just aren't metrizable ;)
I have no advice on how to overcome the wisdom/experience gap and unrepaired damage accumulated over time.
You end up with people like me who are told by a friend that they will open up a senior dev position just for you. That means the other people who post to that role are putting effort into the interview process but all for nothing since I'm pre-selected. So I don't ask them to open posting so I don't take the position. So I think these backroom deals are wrong, have been taught that by society, and so I get screwed like every other unconnected person.
There is no world where social skills somehow are ‘bias’. They are core.
But I agree totally. Most of my family worked in the public sector, I had no idea about any of this stuff until I started trying to get a job. And some of the people who I grew up with who were totally incompetent but were sociable/well-connected ended up doing very well (I went to a private school, so my sample is quite interesting: I know a guy who was very smart, went to college, trained in law at the top law school in my country, worked hard, but couldn't get it together ended up becoming a chef...meanwhile a guy who got straight Ds, scraped into uni, did no work whilst there is working as a PM at a top fund manager...they don't teach you this part of life in school).
On the OP: college isn't real life, it isn't anything like real life at all because you don't need to be an expert or have knowledge to extract economic value (and that isn't a bad thing at all). As someone who went to private school and saw a decent amount of privilege, it didn't helped kids who came from poorer backgrounds. These kids went to college (which probably would have happened anyway, they are smart) but most (not all tbf) struggled in the real world because they had poor social skills. I have a long list of utterly mediocre human beings who are punching well above their weight in life (and tbf, this is a bad thing...the guy I mention above shouldn't be managing anyone else's money...not to be harsh, he just shouldn't), and a list of one or two people who came from a poorer background and got out. I think that is down to a combination of socialization, understanding business, and nepotism (I wouldn't overestimate the latter, all of the people who punch above their weight had the ability to walk into a room and make another person feel like they had known them forever).
Yeah, the world is a social place. There's a reason European royalty sent their kids to etiquette classes, and even these days fraternities and sororities have formals. That's how the world works. Someone that's surprised by this in their 20s or 30s was failed by their parents or immediate community and this has nothing to do with college.
You need to be nice to people, you need to be friendly, you need to know people, attend events, be fun and jovial, etc. Politeness and relationships are the underpinning of our entire society.
But if you're introverted (like me), this takes very deliberate practice. Over the past few years, I've posted in every monthly "who's hiring" thread here on HN as just an exercise and to meet people (mostly local to LA). I've met dozens of really cool entrepreneurs, fellow engineers, VPs, C-levels, and other smart folks. Most of these connections will go nowhere, but I wanted to practice being more outgoing by grabbing a beer or coffee and talking about life/technology/anything with strangers. I was able to put together an investor I met with a friend of mine that's trying to raise money; was able to pitch some startup ideas to folks that worked in that domain; but more importantly grow my rolodex and become more comfortable with the art of networking.