...there was a good deal of sarcasm and snark directed at students and I recognized, uncomfortably, how much I myself have engaged in this kind of communication

...there was a good deal of sarcasm and snark directed at students and I recognized, uncomfortably, how much I myself have engaged in this kind of communication. No dark sarcasm in the classroom Teacher, leave them kids alone Hey! Teacher! Leave them kids alone! (All in all, I agree, this should have been obvious without having to shadow any student at all.)