For what it's worth, that kind of surety that one knows every region comes off as rude in quite a few places as well.

For example, it was quite amusing and annoying watching a coworker insist that the rural area I originally came from isn't rural because it doesn't meet his personal definition, though he had never even been to the state.

"I don't see why" is a valid way of expressing a lack of understanding combined with a spirit of collaboration where I am from.