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Not sure if a reading comprehension fail or a willful misreading of my comment - what did I say that gave you the idea refs aren't allowed to hold opinions? The sole problem I think he will/should be punished for is calling someone a German cunt. If you mean my last point about undermining trust - exactly as you say, I think it's unhelpful to have their opinions broadcast in such crude terms, not that they shouldn't privately hold them.
Are referees not allowed to hold opinions then? Which is what you seem to be suggesting.
He’ll be punished because he was stupid enough to be filmed expressing those opinions, not because of the opinion itself.