Wow, now that you put it that way, I guess I'm wrong. I had no idea I was crippling the national economy and exacerbating the education crisis. And here I thought I was just trying to get to work on time. So naive I've been!

Please. I ride on the road, which my sales tax dollars have helped construct, and I obey the California Vehicle Code. I expect the drivers behind to obey the Vehicle Code too. I ride on the right, in a bike lane if provided or "as close to the curb as practicable." But I interpret "as close as practicable" liberally as necessary to ensure my safety. Not to ensure the convenience of drivers.
I consider it assertiveness. If you or a following motorist considers it arrogance, so be it.