I turned away from the C++ unity towards the Rust community because I saw the same issue as you, and am very happy about that decision.
(I guess I'm old and misanthropic but I would not seek out answers by asking on the internet, but instead by reading one of the many excellent books on C++. It's not some obscure hobby where you need the collective wisdom of old hands.)
Now, I've been doing C++ for 20+ years, and the only real way to get help/mentorship in my experience is people you work with. There are too many ways to do any given thing in C++ and what you want is to follow the coding practices of the team.
One thing i have noticed is that many people trying to learn C++ (or any other language for that matter) don't even do the basic homework (eg. read a book) before asking questions. They expect everything to be spoon-fed and to "easily" understand it all. Even a little effort is too much. They simply lack the commitment and persistence to learn anything non-trivial.
Kind of proving the other persons point for them...
1. stackoverflow is a bad "community" for any field.
2. I described how I would approach learning C++, based on my personality. I didn't "direct" anyone to do anything. Especially since I phrased it as a literal parenthetical.
I wanted to learn more low level programming when I was a C# dev, and coming from an OOP background, I chose C++ (also I had encountered c++ in school as a first language) . Man, was it humiliating asking questions even on stack overflow. Apparently everything is obvious and I'm an idiot.
In any case, I dropped C++ (not because of the obnoxious community but the language felt so poorly designed, coming from C#) and turned to C. Its been so far an amazing experience learning from C community. They are deeply insightful about computers and genuinely willing to help new engineers. Very experienced and very high calibre c engineers were helping me out without trying to show off how much smarter they are than the rest of the world despite being clearly far better and smarter than I am.