I think my expectations for behaviour are roughly those of the 1950s, but I seem to get them somehow. I once got rid of two pupils because they spoke ill of Wilfred Owen, MC. I think they failed their exams.Nope, I'm a scruffy lazy bastard. I just happen to quite like teaching (the paperwork can get fucked).
Dreadful is a strong word. Having spent time in a Requires Improvement school things are pretty much golden in decent schools. Most of it depends on the management team - if they have a spine and are willing to stand up to parents then there's no real issue. If they actually go out of their way to back teachers then it's a paradise (that doesn't happen often).
If management are scared of parents then you're fucked, no matter how good things look on the outside. I heard some interesting comments from a teacher at one of the UK's most prestigious public schools who was moaning about how parents demanded grade As (it was about 8 years ago) despite their child being thick as two short planks. The argument was if the parents are paying £40k per term then the kid should get As.
You get the behaviour you expect, to a certain degree. Not that that ever stopped some little shyte throwing chairs.