I'm tired of it, too. It's as if Middle Americans are the only true, hardworking people. My teeth also grate whenever I hear them saying "white working class." 😒
However, one thing I do think is strange is when I hear an MSNBC person give the time and say something like "10 Eastern, 7 Pacific" and never mention the other two time zones. If I lived in middle America, I would be upset about that.