It’s pretty common to see posters questioning whether someone is a real City fan or not, but it’s a pointless debate unless everyone has the same understanding of what being a real City fan actually means. Not that we’re ever likely to come to a consensus, but just out of interest to see the range of opinions, what’s your definition? (it's trickier than you might expect, when you try to spell it out)
For me, the simplest definition is someone who would want City to win in any game we could possibly play. You might like City a lot, but if you have stronger feelings for another team, then I don't think you can call yourself a real City fan (this seems a bit harsh if you follow City as well as, say, a lower division team, but I can't think of any way around it - if the two teams played and you didn't want City to win, it's hard to consider yourself a real City fan). I don’t think it matters where you were born, or how many games you’ve been to, how many generations of your family have supported them, or how long you’ve supported them. If City are your number one team now, you’re a real City fan in my opinion.