I'm saying you need to use your better judgment. If I did everything my mother and father told me to do, I'd never grow as a person. It's how you truly become an adult, how you become your own person. Obedience is fine. Blindly following is not. It's a very, very fine line.
It's not different. There will always be Muggles who are awful just like there will always be wizards and witches of all sorts of purities and not who are awful.