The same as for girls who can’t get a date: everyone wants to date the most attractive people. No one wants to date an ugly person. So those at the bottom of the attractiveness scale for men and women both have a hard time. This applies to more men than women though because guys are generally less picky. So that’s why there’s the whole male incel cryfest culture. Well, That and Patriarchy.
But there’s someone out there for everyone if people would just look past what’s on the outside. Sadly many never learn to do that.
Guys: read bell hooks.