^^^ School have always had rules and what makes you think that the kids in the video won't be any different while in school compared to how they are in the video? You also ask what are school official doing on kids social media? Anyone could've ratted to them about the video that was made and when they saw it is anyone's guess.
Isn't it interesting that you avoid quoting my post, as you always do, most likely because I asked you to prove that schools have right to regulate kids behavior when they're not on school's ground, and to avoid answering my questions.
I agree, schools do have rules, policies, regulations, all of them concerning student's behavior on school's ground. Yes, they can regulate what kids can or cannot wear when in school, what they can eat or drink, they can ban skateboards, bicycles, make up, or regulate how to address teachers, staff, etc.
So let's say, in order not to upset immigrant kids, school doesn't allow wearing a shirt with American flag on it. Then they see on Instagram or TikTok that kid wore shirt with American flag on it. What you're saying, school should, and have a right to kick the kid out of school, and deprive the kid of graduation, because kid did not respect the school rules about shirts with American flag, all in order to prevent school shooting because some kid might get offended by the shirt.
I must suck to be a leftist, does it?