Quoting Elliot Reid:" My friend, who is in his 20's, absolutely hates his father. Heres why. Lets call his father B. B was ... [snip!] ... its left him messed up but he says if he ever has kids he will never treat them like that. So why didnt B think that way too?"
No, it's no excuse (and this is coming from someone who comes from a long line of abuse...it's almost like a family heirloom being passed down through the generations). For him to treat his daughter like a princess and his son like smurf tells me that he KNOWS how to parent, he KNOWS how to treat his children, he's just being an smurf and playing favorites. At least in my case, my dad treated my brother and I both like smurf and treated his nieces and nephews like gold. He knew how to be a friend and an uncle, but not how to be a father.
When you have children, if you're a decent person, you try your damnedest to break the cycle of abuse and not put your children through what you went through. Period. I have made that vow. My brother, however, abuses everyone around him. He's a very angry person because of our upbringing.
A person can CHOOSE whether or not to let their abuse negatively affect them and in turn affect those around them.