Same for the us, though. NY, Boston, Midwestern, New England, Minnesota, Atlantic, Southern, Texan, Pacific Nw, Californian. And various specific regional like queens, Brooklyn, Philly. It goes on and on. The US is not the monolith it’s often described as.
The LD characters seemed annoying because they were cartoonish, on account of them being cartoons. They played it up to be how people act in the future. But it doesn’t feel out of place in the actual cartoon. Imho.