I think it's simply because many people here dream of some day becoming the next Gates, Bezos, or Elon and they don't really empathize with the thousands and thousands of people whose hard work actually creates that ridiculous amount of wealth.
I'm not sure that's true; the 1%/10% dichotomy gets abused a lot, but there are some salient differences; most of my professional circles in their 20s are making up to half a million dollars in their 20s at a large tech co. Whether you consider it myopic or not, it's easy to see why they (and those aspiring to be them) would consider a labor movement to be against their interests. And it certainly represents a much larger (and more reasonable) group than those asusming that they're going to make billions from founding a startup.
