Your industry (tech) is causing values to skyrocket. Which is fine, but not everyone in a single area is going to work in one industry. If a bunch of wealthy people want to live in one place (this happens in CA a lot) why should your taxes go up punitively? That's why prop 13 was put in place. It really puts a value on homeownership--investment in an area, and investment in the state.
As a renter, you have far less invested in CA than a property owner. A property owner who has been in place since the 70s has paid decades of taxes (all: income, property, etc), utility bills, etc, that have made the state the way it is--for all its problems, CA has some of the best public higher education in the world. This system has helped silicon valley out tremendously as a viable competitor to the ivy league system for an extremely talented workforce.
You have probably been here for some time, but not decades. Why should you get to tell these people they don't deserve what they've earned? If the tech economy crashed tomorrow, would you still be here? I doubt it.
I got in-state UC tuition but my parents paid decades of income taxes. I own one of those pieces of real estate you probably look askance at.
I understand that housing is sorta a pain for you, but for many people these pieces of real estate represent a lot of value: sentimental, and a sizable chunk of their net worth. If you're going to advocate for redistribution, there are MUCH better targets for your ire in this day and age. Otherwise, pay up, and then in 20 years run your mouth on some out-of-state carpetbagger or teenager who thinks they're entitled to something you put 30 years of mortgage payments towards.