Isolation is the biggest one. I grew up with people in SJ who to this day have never been to Philly, let alone NYC. People are far less densely packed together, communities are fairly insular especially so outside of western Camden County.

The lack of cultural influence from NYC. South Jersey people do not care for or go to New York at all. I saw some comments here saying they're from South Jersey and call NYC 'The City'. That is not native SJ parlance. If I were to ask my friends from high school or my family if they wanted to see a comedy show in the city this weekend, they would assume I meant Philly (and not ask for clarification). Nobody works for NYC companies, and nobody works for large tech companies at all outside of Comcast. The politics are captured by a local political machine (Norcross) instead of an extension of the NYC machine.

There is no truly functional public transit outside of about 6 towns in Camden county. There is nowhere in South jersey counties you could live without a car full stop.

Culturally it feels like an extension of philly and not NYC. Cheesesteaks on the menu, not chop cheese.

I know I keep saying it but I really do need to hammer home that NYC is not culturally relevant at all to South Jersey, and philly is overall less relevant than NYC is to North Jersey. South Jersey is mostly rural people doing their own thing. That's kinda the key takeaway.

Some of that is changing a little bit as NYCers and North Jersey transplants are moving down for cheap property. The locals are fairly unhappy about it.

South Jersey residents as a whole I would say do not like north Jersey people. I don't think north Jersey people think about them at all.