Most importantly, you skipped the biggest part of my post. Having any preference at all regarding a potential partner is selfish, by your standard. If you don't just start a relationship with any random person you meet (not based on their appearance, their personality, or even their gender), you're being "selfish", going by your idea.
If you prefer a woman with a good sense of humor, that's just as selfish as preferring big boobs. Preferring an intelligent woman is just as selfish. It's not just looks. Any time you favor one trait over another, it's all about what pleases you.
Also, I'm not sure which part of this you're not understanding. Obviously there is more to a woman than her boobs. Obviously we're not saying we only judge a woman by her breast size. Your comments are better directed at someone who claims that they only judge a woman based on boob size. They are not appropriate directed at someone who holds a woman's personality in higher regard than her boob size.
But there's also nothing wrong with only choosing a partner based on physical appearance. People call it shallow, but so what? If that's what makes you happy, and you don't care what her personality is like, I have no problem with it.