The FIRE community and my own personal situation prove you very, very wrong. It's absolutely possible for a upper middle class family to retire in their 50s, even in their 40s, if they live frugally.
I retired on my 40th birthday, and it is AWESOME.
The thing is... no one has anything that I want to buy. I don't mean this in an elitist way, but more of a monk way. Like, I don't understand status and keeping up with people.
And health insurance as soon as the ACA is gutted and you have a pre existing condition? Sure I could retire to Costa Rica or Panama. One of those are a plan B and we will be in CR for six weeks and we are both learning Spanish - I am. decent at it.
I bet you also your idea of upper middle class is not statistically valid.
Statistics! Can a person below the median income afford to retire early? The answer is a resounding no. Can a person the top 10th percentile (upper middle class) afford to retire early? Yes.
Thanks for living frugally. Since you now have some spare money, I decided it's time for a rent increase. And a tax increase.
"Live frugally" , "FIRE" , "work in tech"
All incompatible with 99% of the upper class, neither do they want to eat ramen to retire early.
You're also one medical disaster away from being "very very wrong"