Particles of dirt/sand/dust in your pocket can be MANY, MANY times more abrasive than keys, pens, knife, etc. It doesn't matter what freaking phone you have- even if it's made from honest to God Gorilla Glass on all four sides- it will frakking scratch. What do you expect? An impervious phone? Slap a protector on the screen and move on.
Calling Apple liars because it scratched is just stupid. If you don't want it damaged- frakking protect it! Same with dropping the damn thing- it DOESN'T matter what phone you have- IT'LL BREAK EVENTUALLY. Why do people always act surprised?
If you are smart, go to your basement, turn it into a lab, and create transparent adamantium. Voila- problem solved.
I think people are suprised because their 3G screens did not scratch as easily as the ip4 with the same usage pattern. It surprised and disappointed me.