When people talk about bad parents, they typically mean alcoholics or drug addicts who beat wife and children. However far not every bad parent is so obviously bad and problematic. Most bad parents are more discreet.
One such type is parent who are full of vanity and want their children to waste a lot of their time and effort to pursue activities such as ballet or music. They say it's for their own good but in reality, it's all about parents own vanity and desire to brag to their peers about their kids' "achievements". Children's own needs and interests are typically ignored and sometimes shut with hypocritical "it's for your own good" or some other excuse.
I had that kind of parents and know many others who also had to deal with that. They made me waste a lot of time on things that did not help me in life but allowed them to brag to their peers and feel "proud" Despite that, selfish greedy bastards always complained I am not doing enough. I am not some puppy dog to bother pleasing them.