I know 3D doesn’t work for everyone. Those posters where you’re supposed to see a hidden image when you stare at it for a long while never worked for me either.
Hopefully, the rumors of a glasses free display tech come to pass.
Those posters are a different thing, though. You have to intentionally misalign your eyes so that each one sees the proper field to create the stereoscopic image. It’s a skill not everyone finds easy to learn (I could never get them to work as a kid, but as an adult years later I find them rather easy to do). But for 3-D movies, the only necessary “skill” is putting on a pair of glasses…