Earlier this season, Neville called for the Reds to sell Robertson after a rough start to his Anfield career. But he has since held his hands up and recognised the superb form of the 24-year-old.
Robertson told the Daily Mail: "Maybe he hadn't seen me play enough.
"Maybe he just thought it's a signing from Hull.
"I don't know what his thought process was but it's one man's opinion. If he thought I wasn't good enough, no problem.
"But these are the people I want to try to prove wrong. You want to make your fans and your family proud. But it's the people who doubt you who motivate you more.
"I'm quite good at dealing with it. I was confident in my ability that if I could get a run of big games, I would build on it."