As usual, the people you fill the space with make all the difference. The stereotype gets reinforced by the kind of suburbs HN people tend to live in and to have been raised in.

Wealthy white collar suburbs almost universally suck because people don't really miss out on much by not interacting with each other and people have no real problems so they tend to make each other their problems and not like what their neighbors do.

You go down the economic ladder and things get a lot better because people have enough real problems they don't give a shit about whether their other neighbor pulled permits or what the setbacks are or how long their project car/boat has sat on blocks, and they interact with each other because being friends with your neighbors well enough to share tools and trade favors is worth it.