It looks to me like Johnson is already suffering a lack of confidence, and of course has been struggling for fitness. He's been playing in makeshift and varying back fours, and with varying players in front of him (Kuyt, Meireles, Maxi, Cole).
When your position requires covering a lot of ground up and down the wing, you are inevitably going to find yourself stranded a few times in a game, when the opposition break forward. It requires the other players you play with (Kuyt is good at it) covering and exchanging places with you, or else like Johnson you are the obvious scapegoat the guy out of position. But Maicon and Ashley Cole (viz the 2 goals we scored against Chelsea last week) are also often caught hih up the pitch and not defending. Nobody slags them, because they play for successful, well-organized sides that have been winning their leagues the last few years.
Johnson is a decent player. He needs encouragement, and the team to gel with him.
And Hodgson needs to stop slagging his own players in public. That is not - to coin a well-worn phrase - the Liverpool way.