Actually, it's Californians who generally dislike "diverse" communities.
That said, they're not that rare. They exist in all of the bigger cities, SF, Oakland, Berkeley, Sacramento, plus places in the LA basin. (I don't know about the inland empire.) Heck, it's even possible to find them in almost every "college town". Almost every small town is "diverse".
In short, your real complaint is with places like Santa Rosa. Move.
> my biggest problems with California are prop 13
Prop 13 is the only reason that CA cities and counties aren't having to choose between a 20% drop in revenues or a 25% increase in property tax rates this year.
About half of the homeowners and the vast majority of the commercial property owners are going to see a 2% increase in their property taxes this year. Meanwhile, folks who bought recently may see a modest decrease in their property taxes.
As a result, CA's property tax revenues are going to be fairly stable.
Prop 13 is a cap on property tax rates and a limit on the increase in "value for the purposes of taxation" wrt a given owner of a given property. When property changes hands, the value for taxation goes to the sales price, but as long as it doesn't, the rate of increase is capped, which is why many owners (especially commercial) will see a modest property tax increase even though their property lost value in 2008 - the property tax is catching up slowly.
Remember that "cap on property tax rates" that I mentioned above. Almost every CA city and county is at that cap. Do you really want to argue that they would have dropped the rates to keep revenues stable during the years when property values were exploding? (Prop 13 was enacted during a previous boom when they didn't drop rates....)