Why do people from Yorkshire feel the need to tell you that? It is fairly unremarkable given that the collective Yorkshire counties form a large part of England so lots of people are from there.
Yet still they do. Repeatedly. And will shoe-horn this revelation into any given conversation. Eg "I'm from Yorkshire so I don't like spending money on heating". Well yes I'm sure this is true; nevertheless this is not a special circumstance given that most people do not enjoy spending money on heating. Or they take something that is particular to them and still gas on about Yorkshire eg "I'm from Yorkshire so I don't wear blue shoes".
Never have I met a crowd of people so keen to assert common identity yet so unaware as to how common identity actually works. Although ironically that's an identity of sorts.