Not throwing daggers or anything, but every strata has things that are a bit strange about them.
Yes, I know that upper class does that too, unless you are in the hills where there really isn't any lawn to take care of, etc.
That's entirely the point. Lawns originated in the middle ages as a status symbol. They demonstrated a) that you could afford to waste a perfectly useful piece of arable land and b) you could afford to pay a team of men to neatly scythe and shear it. It's hard to tell how much land an aristocrat actually owns, but the size of their lawn acted as a reasonable proxy.
The invention of the mechanical lawnmower helped to democratize the lawn, establishing it as a symbol of middle-class suburbia. A small lawn in front of a suburban house didn't demonstrate that you were gratuitously wealthy, but did demonstrate that a) you could afford a larger plot of land than strictly necessary to accommodate your house and b) you had leisure time to spare.
Try liking somethings considered as "white trash" hobbies/entertainment/activities, or as "posh" ones as a middle class person.
(E.g. a middle class high schooler who likes the opera instead of say, Hip Hop or whatever. Or wear some Comme De Garcons clothes around middle class dressed people, or stuff you bought at the Dollar Store...)