The right thing to do...
Oh cute, you cared enough to quote each sentence again. Look at the kids in the class who are embarrassed that he is making a disturbance, hands are over faces. Shit, I curse too - but he was kicked out way before that. IMHO he deserved it.
I'll agree that we don't know the context over what happened both before and after this recording, so none of us know the real story here. It does not appear to be a simple critique. Also, no one is forcing him to be there against his will. I actually agree with you about earning respect with friends, but you don't get that luxury in high school with teachers.
To the point of home schooling - I'd rather not have an Unschooled Doctor operating on me to save my life, but I am not discounting the value of home schooling. There is value in both.