If you record a teacher in their classroom without their knowledge, you are an asshole.
If you are a parent or a Principal relying upon such a recording to criticise a teacher, you are an asshole.
If you upload such a recording to social media, you are the worst kind of asshole.
If you are a public commentator or media company relying up such a recording for cheap laughs and/or cheap sanctimony, you are the worst kind of asshole and the worst kind of leech.
If you consume such media or social media and regard the teacher to be the fundamental problem, you have got things way, way wrong.
Short of a demonstrable crime, none of the above is countered by arguing, even correctly, how bad was the teacher’s conduct.
Are we clear?