It will be United, despite the millions of United fans, the rest of us hate them, purely due to envy of their success.
The same reason why a lot of people hate Chelsea, because they brought their success, they would have done F*CK all otherwise
And that same reason is now following over to Man City.
Rivalries are a different story you hate them REGARDLESS!
But hating clubs generally generates from envy of success,
do you know anyone that hates the underdog?