2. Patties are popular within Jamaican cuisine.
It's not something very niche. I think my comment was perfectly fair. It's like not knowing what empanadas, samosas, shumai, or takoyaki are (and yes, one would be uncultured for not knowing any of these too). It betrays something about the cosmopolitan-ness of your life experiences.
It's not even about geography. I'm pretty sure a good proportion of even Torontonians don't know about the Jamaican patty, and I'd call them uncultured too.
There's nothing wrong about being uncultured, it's not the end of the world. You can even work to improve it.