For me, the issue with people not thinking about the others around them extends to talking on rides. Like I get that every once in a while you're going to exclaim at something, or laugh, or point something out to someone in your party, or yell at your friend who's in the fake driver's seat because they've clearly driven you down the wrong path. That's fine, that's not what I'm mad about. What did annoy the heck out of me was the one and only time I had a chance to ride N'avi River Journey on my last trip, someone in the boat with me narrated every single moment of it to their child. "Look! It's an Avatar-Bird! Look at that, that's called an Avatar-Lizard!" I kid you not, they were acting like they were teaching their kid the name of every species on the ride...but since they didn't know any of the names, every single one was "an Avatar-fill-in-the-blank."
As to the original topic, I remember a CM using the loudspeaker system on PotC to tell someone to turn off camera lighting one time I rode it. I think it's one of those things that's against the rules, but whether a CM enforces it depends on whether the CMs on duty have the energy and drive to deal with it.