Thing is when you act so arrogantly about something you've got so badly wrong, you make yourself look incompetent. If he'd said to the players "look, from the angle I'm at I didn't see it clearly enough" then the players would still be angry but at least they'd understand.
The best refs communicate to players, they don't wave them away dismissively when they've just dropped a massive clanger.
Watching the video again mind I'm baffled as to why the linesman didn't flag for it, he had a perfect view.