Most people over the age of 30 or so can’t see the difference. We didn’t grow up with high frame rates and our brains didn’t train on them. It’s entirely possible they have no idea this is a thing.

I’ve seen some videos where different people try out gaming trials on different Hz’s and it seems like older gamers don’t get nearly as much performance improvement from high frame rates that younger players do. They’re also much less likely to be able to tell which is which in a blind trial.