Depends on whether you think he's rotating or dropping players. He did it last season too, there was a Stoke game last year where De Gea and Lindegaard both didn't play and Ben Amos got the nod (kept a clean sheet too, lovely stuff). Giving Lindegaard a go if De Gea made a mistake in the previous game every now and then's alright, it's when you're making a point of singling him out in your post-match interview that there's a problem. Doubt that'll happen again though since Lindegaard did a Kuszczak in that Reading game.
Fergie's always swapped players in and out, probably a good test of the players' mental attributes in the long run. Good bit on Sky today where they interviewed Cole, Yorke, Sheringham and Solskjaer. Very interesting, especially the impact of signing Yorke in 1998 because he added to the competition. If one player was left on the bench he'd want to come on as a sub and make an impact to prove that he should be starting.
No way Andy Cole didn't have animosity for Teddy though. I love Andy Cole but srsly bro.