Need more people like you. Lol

I think the fine line is hazy. I think when it is out of line and not enough is where people from Philly really want to stop the "band-wagoning". I could bring in examples like university students like Temple and Drexel from New Jersey or Delaware. Seems to make for a confusing situation where you would think they would say where they're from since they're living in Philadelphia to Philadelphians but get caught in their lies. The bottom half of the paragraph is a tangent so feel free to ignore.

Is there anything wrong with saying you're from Glenside since you spent your childhood I'm assuming growing up there? Seems strange to claim Philly with examples of spending time in the city.

You can say it for generalization since people are unfamiliar with smaller areas. If push comes to shove, you should state where you actually are from. There is always the better of alternative of saying you are from PA or NJ.

Strangely, many not from Philly would disagree with you.