Sorry, long.
Austin makes good points. The sting of the bite is there for nearly all. But it’s somewhat relative- to the total money one has, the discretionary choices made, and what remains, to live on. Then factors like family size, unique needs (needs, not optional choices.)
Imo, trying to put this into fixed income brackets (what exactly is UMC?, whether 130 is the low end or pretty good, whether the high end is 350, 390, or more,) distracts.
The academic discussions of “class,” btw, go on for years. No thread will resolve that. Among social scientists, there’s acknowledgement that education levels achieved, certain cultural factors (what one values/pursues,) one’s perception of “struggles,” neighborhood, one’s idea of the Joneses, and more, contribute. In fact, one can be poorer in dollars and still feel they embody UMC values. Or be exceptionally wealthy and “feel” lower or middle class.
Much easier to fall back on: the good family earning X, has less money than the good family earning 2-3X. IF we all paid 40%, some would have less left over, for basics.
So, there’s not always sympathy for the higher earners, who can proceed differently, with what’s left. The rest if it, your local taxes, your older car, economizing, don’t change that.