Yuppies are young urban professionals https://www.dictionary.com/browse/yuppyMaybe my definition of Yuppies is different than yours. I always thought of yuppies as what happens to most kids of wealthy parents or trust fund babies. People with no discernable skills who still have a fancy car and a house in the trendy, upscale neighborhood with no idea about how the world really works, thinking they earned their cushy lifestyle.
They were by and large Reagan Bush supporters. Think Alex Keaton on Family Ties. They were absolutely not liberals. If that's what you want, you'll need a different word, because they weren't yuppies.