I think its asking way too much of someone who wants to join a casual site known for cat pics and meme jokes to read through the couple dozen default sub rules. There's no practical educational solution here. The volume of new users and the labor of understanding all these rules is huge and its impractical to expect people to digest it all, especially for a topic most users, being male, aren't into. Lets also not be ignorant of the massive feminist thought that dominates subs like 2x. To you, its mainstream, if not conservative, to others its very different from what they're used to. Why do you think subjecting random people to that and not expecting some kind of reaction?
Reddit's idea of default subs seems flawed to me. Perhaps it should have suggested defaults when you make an account and you choose what you're interested in. Non-logged in users should get, maybe, randomized top 500 or so subs. Hand-picking subs, many of which are instantly polarizing (atheism, worldnews, politics, 2X, etc) is really an insane way to run that site.
Worse, once a sub is made a default, its quantity goes up but its quality goes down. /r/writingprompts was once a fun place for authors to get some practice. The highest rated stories were usually good for a read, but now its a default sub, and its unreadable. The top comments tend to be half-assed efforts usually ending in a joke or even a reddit in-joke because the guy who posts something silly immediately will dominate while the guy still working on his story and posts after an hour of writing ends up being comment 78 and no one scrolls that far down to read. Heck, that sub is so bad, that if you want to read a decent story you start at the bottom, with the lowest ranked items, and scroll up. Talk about failure of design!
/r/books was an okay resource for the casual reader and now is dominated by items that are, imo, much more lowest common denominator. I'm sure there are more examples.
I really think reddit is about ready to have its disruptive MySpace moment when some Facebook-like competitor moves in. The default subs are unrreadable dreck, the politics a mix of the ugliest libertarian meets social justice warrior crap, and the mod policy a schizophrenic per sub mess that pleases no one. Most subs seem completely overwhelmed and just resort to strict rules and 'self post only' policies to keep some level of sanity. This isn't a sign of a healthy system.