There's a difference between criticising him and abusing him.
Too many people launch into the latter, even if they did intend to only do the former.
He's not good enough any more (I'd thought that his legs had gone a couple of years ago, never mind now) but he always tries his best.
It's one of the fallacies about our support that the fans will get behind you as long as you try. That simply isn't true unfortunately.