Ok you seem like an expert on this so I'll just trust you that there is not an aspect of popular male culture that makes many men lonely. It's just social media incels.
The average adult man definitely socializes just as much as the average man. You've found that old guys have as many friends as old women in your research, right? There haven't been studies about this going back decades or anything - it's all incels on social media. My bad.

Hackernews is a VC-funded website for techbros who want to feel like they're cool and smarty hackers. It has an even higher percentage of know-it-alls than reddit. MBAs who got into it for the money.