You've misunderstood the analogy. The analogy isn't about fans of clubs, but about the clubs themselves, their position within the footballing pyramid and the overall progression of football. A lovely bit of xenophobia there though.
Football is like dating. In the good old days, you only really got to f*ck the women you saw in the local pubs or clubs, and in that sense you were competing against a tiny few, meaning you had a chance to bag the best looking broad. Things have changed though, with the development of social...