Well sure. The point I contest is that the definition of middle class is “the class of the person/household with median income.”

Currently in developed countries it happens to be the case that the people with median income are middle class. However this was not always the case, ie the group referred to as middle class did not always include people with median income and so the above definition does not coincide with what middle class typically referred to.

The entire comment chain was not about some abstract middle class, rather middle class in the US right now.