Hey people, give the guy a break.
Shimy hasn't blamed the 360 for damaging his disc. He’s acknowledging the fact that he knocked the console while it was on and that the underside of the disc was damaged.
In an attempt to get the disc repaired he took it to Blockbuster to skim the underside. After the "repair" the disc is now damaged on the topside (data layer).
Now here is the important part, was the topside of the disc damaged before his trip to Blockbuster (i.e. was it the 360 that did the damage when it was knocked) OR was it the disc repair at Blockbuster?
Again, Shimy didn't start his original post blaming the 360 so don't go jumping down his throat!!