HA. That's such bullshit. What a mommy's boy.
Sorry, I'm a tad mean.
But no, really - I'm very close with my mom, but once I'm married and am making a new life of my own with someone, my mom's word isn't going to come first. My husband's word will, because he's the one who I live with and ultimately will face most consequences with.
Your friend is a dumbass if he can't see that.
You can't live in the past, because you've got to live for the future.