It’s incredibly common in the US, especially among younger people. This was just on the first page of my search but I’m sure you can find tons of similar stories over the years: https://www.msn.com/en-us/tv/news/more-americans-prefer-watching-shows-with-subtitles-study-finds/ar-AA1rj48O
Overall, half of respondents said they use subtitles regularly.
Personally I’ve always done it since my youth as well (around '96.) Admittedly that was mostly because I mostly used my TV to watch late at night instead of sleep… But it wasn’t even unheard of then to prefer subtitles. And it was pretty common at the HD switch over, often citing bad speakers (both quality and physical design.)
In 2019 a friend and I got subscriptions to Regal and began going to a movie a week. Most days we’d plan something, but sometimes we’d just show up and pick something. (We blindly picked Underwater, and what a great surprise. Also decided to see the Tom Hanks Mr. Rogers film and proceed to ugly cry all over myself.)
Then COVID.
The last movie I saw in theaters as a subscriber was Bad Boys for Life. I tried to go see Dune 1. I drove 30m, bought popcorn and a slushee, and waited… But the video file was corrupted. They said they had to redownload it before the next show, so they canceled the showing and gave everyone a free ticket. I never bothered using it. I just went home and watched it for free on HBO Max.
I love theaters, both as nostalgia and just to have the experience. But man, “paying extra to go out of your way” is a difficult sell.