I don't really pay much attention to class, but I answered upper-middle. It's just my "sense" based on education, pre-ER occupation, net worth, spending, travel, house, etc.
DW grew up upper-middle, country club set. FIL was a senior engineer/manager in the Space Race days, and they lived quite well. I came from solid lower-middle. Neither of my parents had a college degree and they both sort-of drifted aimlessly between jobs, unemployment, and various side hustles. We lived comfortably in a modest middle-class neighborhood, but I know they struggled with bills frequently and never had any savings.
Most of the people we associate with are probably middle-middle or lower. We don't seem to naturally relate to typical upper-middle, even though that seems to be where we fit financially. If you subtract the big house, most people would guess we are middle-middle based on cars, clothes, lifestyle, etc.