Would you dump your friend if they spoke evil of their parents?

No its not......the average american has something....and in some cases many things about their parents they don't like. Alot of people strive specifically to NOT be like their parents, and most of us have some sort of dysfunctional childhood story to share or an irritating or odd characteristic to complain about when it comes to our parents and we usually end it with but hes my dad so i love him.... Sounds like you just happen to have a friend or two that truly enjoy everything about their parents and cant fathome or relate to feeling otherwise so they see it as being a wrongful thing to talk "badly" about parents......