If someone tells me how much they love their fake bag, I think there are two appropriate responses:
1) Tell them why I love my bag - because, "It is the perfect size and shape for carrying big ol' rocks of crack*! Hey, if we're flaunting illegal habits, let's REALLY flaunt illegal habits! Woooo Hoooo!"
2) Tell them why I love my bag - because, "It is the perfect size and shape to hold a fifth of whiskey*. I like to consume one fifth of whiskey per day. Hey, at least my whiskey is legal and I am only harming myself. I know that the money from my purchase is supporting Mr. Jack Daniels rather than organized crime."
*Disclaimer: I don't actually drink a 5th of whiskey per day nor am I on crack nor do I purchase my bags based on their ability to conceal either of these items.