In California pulling over is required by law but only when people stack up behind you. So it's only when some dipshit like you is slowing down a whole BUNCH of people at once that they are legally obligated to pull over. Who cares if they want to go 5, 15, or 50 miles per hour faster than you? Why do you want them behind you anyway? I pull into a turnout at the least provocation, and if you had ever heard of a thing called the golden rule, you would too.
There's plenty of good reasons you'll find yourself in the left-most lane even if you're not the fastest car - it's interesting to see the responses from people assuming you'd only be doing that because you're a dick. In any case it is not an excuse to tailgate. It's dangerous to both cars as well as all those following as you're going to turn any minor one car incident into an unavoidable mess of two cars spinning across the highway, piling up those behind.
You could always shrug and just pass on the right, if you're in a state where it's legal, which in CA it is. In most of the cases you'd ever consider passing on the right, they just happen to be legal. See this: CA DMV 21754. I can only assume most drivers who tailgate me in CA when there's a completely empty freeway haven't read the code - I have because I moved there recently.
And while we're on the subject of what the Code actually says, the advice given in the CA code for being tailgated is to slow down. I remember the same applies in the UK code, but sadly not the pass-on-right (left in UK), unless it's the natural flow of congested traffic (I have a UK license too). It's so that braking distance is reduced to compensate for the prick behind you having basically no reaction time gap, and to lessen the speed of the two-car incident he may cause. So hey, it's actually against the recommended code of conduct on the road to maintain or increase speed if you're being tailgated. Again: why don't you just drive lawfully at a decent distance and/or change lane and pass?
And yes, CA is full of single lane roads with no passing lanes. I have yet to encounter a significant amount of time where the car in front didn't use a pull-out passing area. Sometimes they're not well-marked and they'll miss them - fair enough, I've certainly missed a few in poor visibility and held up traffic an extra half mile. In no case would I tailgate to "encourage" them to move over like some drivers do. That's the most absurdly dangerous and selfish thing you can do.