Yea, when it comes to the alt-right / manosphere stuff, I don't think there's a lot of self-selection going on. The social media algorithms are largely steering boys and young men down these paths. Log out and get a fresh IP (or VPN), and take a random walk on YouTube to see for yourself. Within 10 clicks or so on recommendations, you're likely to start seeing one or two alt-right videos, and once you click on one, you're done for--90% of your recommendations will be things like "Become Alpha Male by increasing Testosterone" "Arguing with women and liberals using facts and logic!" and "Mussolini wasn't that bad!"