FFS, can't you see that the message suggests that the people who wrote it feel persecuted by the press.
Now, whether you think that they are justified in feeling that way or not, it is indicative of a persecution complex - even if it is tongue in cheek - and the club will want fuck all to do with that.
The club cannot benefit at all from being seen to be part of that or condoning that.
If a flag/banner suggesting that is in the stadium then the club are seen to be endorsing that feeling by allowing it.
And it will only bring negativity to MCFC, with the press, and anyone else who wants to, seeing it as a sign of pettiness, a lack of professionalism and a childish persecution complex.
Why would the club want to be linked with those characteristic? It would be a PR nightmare for them.
Yes, people can moan all they want about it being a joke and tongue in cheek, but the club isn't in a position to chance itself being associated with such pettiness and it being taken as the view of, or endorsed by, the club itself.
People need to get a grip and recognise that the pettiness of football fans should not be mirrored by a professional club, especially one in City's unique position.