What is with the Possessive "My" When Referring to a City or Public Place?

I have seen MY most used on social media in two forms.

One, somebody moves out of state and constantly posts about how "great MY new town is" and "all the exciting things there are to do in MY town." I often wonder if perhaps they are trying to convince themselves of this more than family and friends left behind. Like their old city was never theirs, but here, they finally belong – or so they want everyone to believe.

The second instance, which I'm focusing on today, is a hometown local who lives in the same city he or she grew up in, constantly referring to the neighborhood as "MY town."  A recent caption I saw really struck my curiosity.

"Enjoying MY afternoon in MY town."

It's as though the person is saying the town is as much hers as her own afternoon belongs to her. I understand it is territorial, most likely some competition. "I was here first. I have always loved this town," as though a new resident can't possibly love the city just as much. But, why not say "Enjoying my afternoon in OUR town"? Surely, there are lifelong residents who love the area just the same if not more, who may also be older in age and can throw that card around for having loved local longer.

Terming it "my" is possessive and segregating, but saying "our" is including others; it is sharing in the love of a community, knowing all the people in the neighborhood make the town the great location it is. The irony is by not referencing this matter of fact, the poster is technically denying that her neighbors are exceptional members of the local community, which is subtracting their influence on making the town the friendly neighborhood it is.

Thus, she is not acknowledging the true reasons why she actually loves "her town." It's almost like taking all the credit for a great community oneself. If it was not for others, the poster might not feel the same and have no desire to claim her hometown her own possession.

In my opinion, repeatedly referring to a public entity as large as a city, town, or village constantly as MINE when that pronoun is out of context in such a statement, it is not showing the local love and dedication the person may think it is, but instead indicating they are possessive, unwelcoming, and in a competition to prove they are the best.  It is an indication of insecurity and feeling shallow.

By speaking highly of your town, sharing pictures and news, and even indicating how long you have lived there, your love of local will surely shine to other residents on its own. Thus, MINE is not necessary to use unless the poster is trying to prove she loves her town more than other residents or possibly is even in a real or imagined competition for local socialite status.