You sure seem to be insecure about your white macbook to be defending it.
The fact is I have used both apple's plastic computers and aluminum computers over the years and the plastic doesn't even compare.
He's not insecure, he's right. No one in their right mind (let me repeat - RIGHT MIND) would buy an Aluminum when they can get a white MacBook for hundreds of dollars less. It's just stupid, because testing shows they are damn-near equivalent. I used to own a poly MacBook and had NO problems with the casing. The majority of the multiple hundred thousand people who bought them had no problems either.