This has some internal logic, but every experience I've had contradicts your proposition.
For example, I'm in my late forties. When I was growing up, it was rare to encounter (out) gay people outside of major cities, and people would believe practically any negative statement about them, not so much anymore. Conversely, in my college town today, most of my accquaintences have never met a Republican, and they predictably believe in a stupid cartoon caricature of red staters. I'm definitely not buying it.
Maybe if you have safe spaces (echo chambers) and overlapping meeting places, but also a strong standard of not policitizing the meeting places, you can get the best of both worlds?
For example, I'm in my late forties. When I was growing up, it was rare to encounter (out) gay people outside of major cities, and people would believe practically any negative statement about them, not so much anymore. Conversely, in my college town today, most of my accquaintences have never met a Republican, and they predictably believe in a stupid cartoon caricature of red staters. I'm definitely not buying it.