My experience with my children's schools has always been pretty positive from the point of view of being treated as an equal. However, my sister is the deputy head of a large state primary and she has some hair-curling tales to tell, of parents who, when called in to deal with their child's aggressive behaviour, have physically assaulted the teacher for daring to suggest their child is anything but perfect, etc.
As with most things, there are good and bad parents. When asked for complaints about parents, you are hardly going to get a teacher writing in saying "on the whole parents are wonderful, but there's this one mother ....". They are going to get all their gripes off their chest and thus the whole article is skewed from the outset.
And I agree that the teacher's gripes about presents is distasteful in the extreme.