It is totally and utterly undeserved in my mind. He seems to get punished over and over simply for the crime that we as a club decided to spend stupid, stupid money on him. That and Gareth Southgate picks him, even though he's clearly one of the top 4 or 5 CBs England have - this seems to go against him.
He's had a very successful career as a footballer. Just look at his career path. It's textbook. Sheffield United, to Hull, to Leicester, to United, each time earning his rise. He's worked hard to achieve that and you need to have dedication and ability to do it so I have respect for what he's done, he's just short at this level.
Criticism is absolutely fine because he's not up to it here, especially when it is focused on particular performances. But it's just become a cheap bandwagon for anyone that doesn't really have anything to say to hop on board and feel a part of something. Especially the neutrals that have no skin in the game, it's just a pile on for no good reason, I can't see any other justification for the consistency of the fixation on him. Some of it also becomes vitriolic.