As a long-time motorcyclist I can attest to the truth of this.
The speed/size ratio of motorcycles is something that most car drivers' brains simply cannot process fast enough to react appropriately. My MC philosophy, which has enabled me to survive 25+ years of motorcycling in California, mostly in L.A., goes well beyond this however. I don't merely assume car drivers don't see me. I drive as if they do see me... and are actively trying to kill me. The second some cager asswipe starts doing anything goofy, I don't stick around to see what kind of festive cluster-!@#$ is going to ensue. I just go immediately to warp drive and put at least a couple of miles between us. (But I also do try my best to minimize lane-splitting, lane-sharing, and other behaviors that enhance the likelihood of a bad situation.)