So, as you aluded to, it's a matter of math. if 20s,30s and 40s males are generally targetting women in 20s then men in general who are in their 20s will have a much worse time.

Some regions like san antonio or san jose simply have more males than females ~ roughly 2-9% more. That doesn't sound like a lot, but run the numbers on this. If 80% of the population is already coupled up, that leaves 20% single. Now if you have 29% males and 20% female, it means single males outnumber single females almost 3 to 2, which is quite a large margin.