never noticed a difference with either in that respects
That is because that comment was bogus only to brag about the company he works for. I work for Walmart where we have LED's on display 24.7 that get touched by thousands of people weekly, guess what? Not a single one breaks. That comment is complete and utter garbage.
Yes Plasma TV's do have a thicker screen, but LED screen's are not made out of tissue paper.