Okay, let's start with the environment: most of California doesn't have enough water, and they're not doing anything to directly remediate that. Environmentally, a lot of the farming is going to be a disaster when the consequences of climate change really set in. Most of SoCal is a desert, but you wouldn't know it from the expanses of lawns that you see in wealthy enclaves. (...But you'll figure it out really fast when you try to go mountain biking without puncture-resistant tires.)

The gun control policy is awful, and likely illegal in light of the last few SCOTUS rulings. But here's the kicker: California has a Democratic supermajority, and they could do things about the underlying conditions that lead to violence in general, and don't. They've consistently failed to seriously address the economic issues that are closely tied to violent crime, things like economic inequality and poverty, criminal justice reform, systemic racism, and so on and so forth. Instead they've opted for policies that make wealthy white people happy without fixing the issues.

Housing; this is where wealthy "liberals" are directly to blame. Dems say that they believe in housing that's affordable, but wealthy elites--which are overwhelmingly Democratic in California--oppose zoning changes that would allow for high density, affordable housing. The result is shithole houses that can cost over a million dollars, studio apartments in sketchy parts of town (see point #2, above) are thousands of dollars a month, an exploding homeless population, and fuckin' awful sprawl.

Taxation: California has long had the chance to show that it's progressive with taxation, and to institute wealth taxes. They don't.

Education: California still relies on funding largely through property taxes, which ensures that school districts with a poorer tax base will have less funding. Again, this is the product of wealth elites--who are overwhelmingly Democratic in California--working to oppose funding changes that would have the effect of making schools in super-rich neighborhoods less desirable, but would also improve schools everywhere else.

Public transit: California barely has it, and it's consistently underfunded. Combined with point #3, it leads to traffic gridlock that's famously awful in major metro areas.

Most of these problems can be solved. The problem is that Dems are being hypocritical; they have a NIMBY attitude that means that, even though they say the right things, they don't do shit.