I was on the subway and overheard some people arguing over la and orange county and I thought why do people do this? Is their some sort of pride in bring born in a certain area without choice?
Human instinct probably. I'll say humans have animalistic instincts too and can be territorial. This even happens on a micro level. Within cities, people pride themselves on living in the better sector or blocks. Don't feel offended OP, just because you're not from the beastcoast.
Same reason people argue about anything being better than something else..............................................
It's a matter of pride and a sense of belonging, also defending the territory which gave you that sense. Only city that has actual basis for being the most desired IS New York City. It's been voted #1 in a national survey for 10 years as the most desired city to live in. LA didn't even make the list, San Fran was #6 and San Diego was #2.