Well yeah obviously I agree with this in principle but do we know he refused to play? Do you have any evidence of this?
Well he didn't play. So he's either refused or he's moaned and not backed down so much he's gave the manager no choice. Let's face it, Godfrey didn't play left back optionally, and Digne would have at least been on the bench.
If it got to that point, it's on the player to apologise and get on with it - he's a paid employee and Benitez is paid to manage his role. Have an opinion, sure, but then get on with it.