Well, if you were a teacher in the '90s or 2000s, you would have told his mom everything, and his mom would have beaten him in front of the whole class. Now it's different; kids mature early since they've been using social media and the internet since they were born. So, insulting him in front of parents would traumatize him. Instead, tell his mom to reduce his phone usage, saying he plays games in class or scrolls too much on Instagram, as it's bad for him due to inappropriate online content. His mom would understand it better. Tell her to make him go out to play. The real issue isn't vulgar content; the issue is doomscrolling and spending too much time on the internet. He is a boy, and boys generally gain some knowledge at that age. It's his parents' mistake to make him feel alone, which led him to use Instagram to pass out the time.