Case in point to what everyone else is saying.
I carpooled at a previous job with two people.
One of them was from a stable established family that owned a nice house swimming pool, land, vehicles, and equipment, and he could have inherited the successful family business with government contracts on the order of a million dollars if he wanted to, in addition to the extensive stock portfolio he'd been set up with. The other was raised by a single mom in a trailer as 1 of 6 children, and never had so much as a career path.
Both of these guys adamantly claimed that they were middle class- the first because he was making about the median income for the area, the second because he and his ex had once had a combined income of over $100,000.