Please let me just add a modicum of sense here.
As BJ knows, I have been a Manchester United supporter for nearly 70 years and I would like to remind people that football is, and always has been, a working man's sport. And is after all just a game. A game that one gives everything in the right spirit of fair play.
Manchester is an old industrial revolution town, growing primarily on it's cotton industry. I for one think that it is wonderful that 2 such remarkably talented clubs grew & coexist to this day.
To all those misguided souls, please remember that the two clubs can share a common path, let's not forget that during, and after the 2nd World War, they shared the same Maine Road ground, that one of of our greatest managers, Sir Matt Busby played for City ( and Liverpool) and that one of City's great goalkeepers, Frank Swift, died in the Munich Air Crash.
I have said my two-penny worth, suffice to say. "Long Live Football" played and supported in good spirits.