To put it into perspective: Cinemas in Japan are chill, it’s not like American or “Western” cinemas where people shout aloud at hyped scenes or laugh so loud where you can’t even hear what the dialog is or talk amongst themselves causing distractions (or yet, using their phone at max brightness that becomes distracting towards other viewers).
Instead: it’s more on immersing to a movie at your own desire, everyone for the most part is dead silent because they know that they are inside a cinema as courtesy is considered, while I’ve heard that is starting or has already started to decline in the US (& Western nations) since the experience of being in a theater isn’t the same as it used to be.
The Untied States is a big country. I would imagine it varies between different regions. I live in Canada, in my local area moviegoers are usually pretty quiet and respectful. But we get a PSA at the start of the movies warning people to be quiet and stay off their phones, so it seems the theater chain has had issues. And then there was the Minecraft movie, which I personally didn’t see, where people acted like idiots at the theatres because of a stupid meme. My cousin who worked at the theatre at the time said they had a lot of issues with that one. Apparently there was a fire at a theatre somewhere in the Untied States when people brought fireworks to the movie