That is the most ill-informed chant ever!
Newcastle upon Tyne, population (metro) 879996. Number of professional football clubs; ONE.
Manchester, population (metro) 2547700. Number of professional football clubs; EIGHT (Bury, Stockport, Rochdale, Oldham, Wigan, Bolton, Manchester City, Manchester United - two League 2, two Lg1, four Prem Lg, one of which is the biggest club in the world!).
"Where we you when you were shit?"
1991: Newcastle struggling at the bottom of Division Two what is now the Championship (terrible name for a second division!). Attendance average: 16879.
1999: City struggling in mid table in Division Three what was Division Two at the time and now League One. Attendance average: 28273. The best ever average in that division, still! Better than Leeds, another one club city.
In the same year City's biggest rivals had the best season ever in their history winning the treble. There was no Newcastle Rovers winning a treble in 1991!
"Where were you when you were pretty good?" (comparing when both teams finished 5th)
2004: Newcastle PL 5th place. Average attendance: 51966
2010: Manchester City PL 5th place. Average attendance: 45513
A difference of 6453. In 2004 no other clubs in Newcastle did anything because there aren't any. In 2010 Rochdale were promoted and had their best home and away attendaces for decades, Bolton got a very good manager and started playing decent football for the first time in decades, Wigan stayed up and got a great manager who has them playing nice football, Manchester United finished second and won the League Cup.