This type of thinking, I.e. that a player should only play a position that they've been labeled in the fans head is white common here too.Enjoyed the radio 5Live commentary where at one point Alan "massive ****" Greene was ridiculing Guardiola for playing Navas at right back just for the sake of it and Keown just shut him up by saying he'd done well against Sanchez and Pep might have found a new RB.
Had Navas been the one who failed to follow the line out after a clearance instead of Clichy, folks would have argued that's why you shouldn't play a "non fullback" at the position. But seeing as it was a defender who screwed up, no one blames it on his lack of defensive knowledge.
That type of thinking annoys me because we know every footballer from high school knows to clear the box after a clearance. Sometimes a player fails to do so, but this has nothing to do with where he plays. Just a brain fart. Could happen to a striker, midfielder, or defender.