I agree, there are plenty of people on the left, or just in general (at least from my experience) that colloquially refer to people in the upper middle class as "rich" and it annoys be beyond all reason. We, as people, should better define what "rich" is.
You are well off if you can pay for a nice house, a couple cars, hold a decent job, and some investments, but that isn't rich. We should only refer to people that have so many resources, and so much passive income, that it would be impossible to qualify how much effort would be needed to properly "work" for it all as rich.
I also believe we need to lose this whole idea of a quantity of money (i.e millionaires and billionaires) because it isn't really the amount of money we should focus on, but the percentage of total resources. In the future, a billionaire could be as common as a hundredaire today. Money, in the traditional sense, can be inflated, deflated, and otherwise manipulated, and is an arbitrary number. What we really aspire to, when we think of being a millionaire isn't necessarily the money (if you are smart anyways) but the resources you would have access to.
Either way, it was cool seeing you in the comments here :) !