I certainly am not incensed when I see a half half scarf.
What about a City fan wearing no colours, should they be refused entry?
Say a fan inadvertently is wearing a coloured top that is the same as the away team, ban them ?
It really doesn't matter, I would rather have a tooth pulled than own one, but for a tourist spending a grand on a trip to Manchester and a game, and buy a souvenir of the trip, who cares.
As for the West Ham owners, have you been to that stadium, do you think they care about West Ham fans, worst Stadium in the Premier League.