You’re right, I’m looking for the right phrasing here.
It’s not that these kids who identify as queer are temporarily embarrassed straight people who haven’t found their soul mates. But if you are a young woman these days, and all the men you encounter are incel brats, it’s quite easy to decide you want nothing to do with them. Women can do just fine on their own now, they don’t need a man for validation. Some of them might discover that, for them, sexuality is a spectrum, and they’ll be fine either way, but if all the men they encounter don’t respect them then that leads them in the other direction. Does that mean they would be 100% straight if they found a man who was compatible? They may not feel that way, but very few external observers would describe a woman who is with a man as anything other than “straight”.
What I’m trying to do is point out that all of these self-described “Alpha Males” who complain about the fertility rate are themselves the problem, because they are so insufferable that women would rather be with anyone else than with them.