Could be...or it's just that teachers don't understand the tech well. And they don't know who is doing what on the other side.
I have seen videos where students have played songs, porn, abused teachers...because they don't know who is talking on the other side(unless they recognise the voice.)
I see this as a way students use to show off...And to take revenge from the teachers who were not good to students during classes.
Anyways....some people realise it in some time. Some never does and keeps bullying others online throughout their life.
Yeah I think this is where the parents have to chip in, especially on the online classes to make them understand what is correct and what not.