It's not a lack of skills. Getting a job (especially your first) is a lot of work. In some ways IMO it's more work than what you would be payed to do. Once you get payed what do you do with the money? You spend it to participate in society.
Except most of our social institutions are gone anyway. Marriage (the larger motivator) is practically symbolic at this point. All that's left are the hard economic ideas, so they can spend it to live in their own place and not deal with their mom. Even those aren't doing so well, look at home ownership or even renting. Is it worth it? Some say yes and get jobs, plenty say no.
We've restructured society so there's no place for these men even if they did find jobs, then on top of that we've brought in millions more men to ensure if that any niche that developed would be immediately filled. This is what people really mean when they complain about low wages or high inflation and it's not something that can be fixed by fiddling with the money supply.