Parents calling their kids in class isn't as rare as you might think...
https://www.nytimes.com/2026/02/25/style/yondr-pouch-school-...
Consider that lots of these people have kids, and when they do, they tend to have a very friend-like relationship with them. Like, they aren't just magically better at this stuff when it's their kid.
These situations are a source of a great deal of this behavior, and the "I can't contact my kid-friend!" anxiety.
Even when I was in high school "I was responding to my mom" was the go-to excuse when caught using a cell phone. I had one teacher who would actually read what was on the screen (this was before locking your phone was common and probably lawsuit material today, but things were different) and call kids out when they were lying. The threat of having a teacher read your text messages was enough to put an end to cell phone usage in class.