I'm gonna side with the kid on this one, mos def.
I can tell he's right by the way the teacher just dismisses him. ''Mhm'', ''get out'', ''you're wasting my time'' - if she actually was right in that situation (and loved the job), she would have somehow responded to the kid, you know, set him straight? But no, she just sits there like a fat slob, mumbling stuff, probably because she knows she's in the wrong. Probably the kind of teacher that hands reading packets to students and thinks it is teaching.
Props for the kid for showing composure and being articulate during the entire video. He made his point.