As someone said, Iheanacho shouldn't have sarcastically applauded, but when he's missed six clear arm round the waist and shirt pulling when the long ball has come over the top, the first time it's the other way round and he blows the whistle, you can understand the frustration.
It's all about consistency. I can excuse decisions I don't like as long as they are applied consistently across both teams.
Some referees have a style, which is to let the game flow, or to call up every foul.
It was like last night he couldn't decide at any one point what he wanted to do and the result was he lost all control and authority.