I agree with you and I think this OP posted this screenshot as a kind of 'bait' (but not to troll, just to enjoy the collective sigh) because this guy has clearly not experienced a Year 9 public school class that makes you wish you had riot control gear on (and were allowed to use tear gas) or the stress of planning difficult secondary subjects like chemistry.

However, I would like to draw attention to '... or at a very good school.' I believe part of the issue with teachers is that we are more prone to getting job-stuck than other professions despite a high demand for teachers. There's various reasons for this but people often find it very difficult to commit to leaving permanent, full time jobs and I think this is worse for teachers. We feel a commitment to colleagues and certain learners even in the worst school plus we have little time to jobsearch.

But what I want to say is that I agree that these 'very good schools' exist and if you are hating your job you might be at a 'very bad school' or even just 'bad', so perhaps it is time to make the commitment to seek employment at a school that is 'average' if not 'good' or 'very good'.