As a very left leaning individual who does not like California my reasons basically come down to all the benign neglect of the homeless (leaving people to rot in the streets with their fentanyl addictions isn't progressive, assholes) the militant oppositions to building housing anywhere (progress is being made but it's like pulling teeth) and the huge focus on performative laws that effect 0 actual change.
... Notably these are all problems in other states too. Most of them just use police to lock them up instead. Not better.
But California rubs me the wrong way because they act smug about it.