Boggarts and similar things must be quite commonplace in wizarding households and anyone other than Muggleborns will have some experience/understanding of such things - Mrs. Weasley cleaning up Grimmaul Place enlists the help of the children and the Weasleys are all quite practised at gnome hunting at home. Learning about such things wasn't what I was expecting from DADA classes.

No. Surely this is the sort of thing that ought to be part of the Care of Magical Creatures curriculum? Although there's definitely crossover between the disciplines; these are supposedly the Dark creatures, although some of them seem to be more nuisance than malignant.