Agree with this.
Your arguement is too simplistic, OP.
Yes, there is a certain small minded mentality of some people who live in small towns and never leave them and a have a distrust of people different to themselves. And yes, these people probably voted for Brexit.
But they are a distinct group of people to people who never left their hometown.
People who never left their hometown can still be highly educated and travel a lot and have worldly experiences, but also appreciate the sense of community of living in their hometown.
I went to uni in my nearest city so lived at home for a lot of my studies, but with terms in London and Germany. This kept my student debt down. I lived in a neighbouring town for a while but moved back to hometown when I started having kids, around 15 years ago.
It’s great being so close to family, friends and long term acquaintances. Sense of community and familiarity is worth a lot to me. Husband and I are both highly educated and travel a lot.
By contrast a friend of mine moved to London straight from school, racked up huge student debt, failed her degree, and is still in London trying to make it as a tv presenter. She is in her mid 40s now and doesn’t own a home, living in flat shares with 20somethings, no steady income, and her mum and dad have to pay her rent.
But in her view she has “made it” because she is living and working in London and she very much looks down on people from our northern town who have “never moved away”.
She is desperately lonely in London but can’t see how that is at odds with how disparaging she is of people who stay in their communities. Big city life can be very transitory and she struggles everytime friends move on, but as long as her parents keep paying her rent, she’ll never leave.
So it’s a lot more nuanced than in your original post, OP.
Particularly now with the internet and working from home etc. Educated people no longer have to live and work in large cosmopolitan cities. My nearest big city is about 50minutes away by train, 1 hour by car, but plenty of people now work from home or commute daily.