Lane splitting and filtering in California is AMAZING. The vast majority of riders here (me included) do it safely and sanely. A few obviously don't and quickly become meat crayons.
The cagers (car/truck drivers) are usually really good about giving us space and being attentive.
I ride a quiet bike but it looks like a cop bike which is even better than loud pipes. EVERYONE sees me on the road and gives me space.
Those dudes that nearly became a land cruiser hood ornament really need to think about what they want in life and if that includes being a quadriplegic or dead. Even the real motorcycle gang guys out here ride safely when lane splitting or filtering. It's extremely rare to see shenanigans like that.