Think of liability as a 2 way street.
1. Someone suing your LLC and trying to collect against you/your assets personally. Generally this is the type of protection you will receive with an LLC (single or multi member) barring any exceptions, such as piercing the corporate veil in which case the plaintiff might go thru your LLC protection and reach your personal assets to collect.
2. Suing you and trying to get to your LLC. This is the direction the single member LLC might not offer protections. Imagine a scenario where you are personally sued and you don't have personal assets to cover the judgement. Say if you owned 1 share of Apple, obviously they can't collect against Apple just because you are an owner, and the same protection will typically exist with a multi-member LLC. However, in the case of a single member LLC in these types of cases the courts will likely allow the plaintiff to collect against LLC and/or even foreclose on your LLC company/assets if need be.
>Does California just not like small businesses?
CA likes revenue and as high as the fee is, small businesses will pay because they don't have options (they could incorporate in CA as opposed to organizing an LLC or moving states).
One possible hack is create LLC #1 in another state, qualify it as a foreign LLC to do business in California, and and the end of the year repeat the process with LLC #2 and transfer all assets from LLC #1 to LLC #2. The only reason someone might not recommend this route is because people prefer continuity of a business, but that shouldn't really be an issue when the main goal is liability protection from side projects.
Edit: dissolve and file final tax return