If my kid brought a note like this home from his teacher, I'd punch that teacher right in the face.
Lack of respect for authority? Damn right, if the authority is a fucking moron! I did the same thing in 6th grade when my teacher couldn't tell the difference between "pi R squared" and "2 pi R". Luckily the teacher had some humility.
I can't even believe this guy has the nerve to be annoyed after being revealed as being such an idiot. Since when is blind adherence to authority superior to truth?!
Is is real? I don't know. Opinions here seem divided