I am also on a male-dominated forum in addition to MN and almost every week there'll be posts and comments with thousands of upvotes advising men to "get capital" because the good looking women all go for men in their 40s and up.
The prevailing theory is that if you're of average attractiveness, you'll be able to get a much hotter 20-something year old girlfriend/wife when you're 40+ and wealthy than if you settle for someone average in your 20s.
This isn't just an online thing. I did computer science in uni and so many of my classmates-turned-"techbros" definitely think like this.
Of course, I do feel for genuine men who have been unlucky with relationships and never got a chance to have kids. I don't, however, feel sympathy for any men who feel entitled to much younger women.