Ride like everyone is out to kill you is right!!
No, in general it's not right; that likely exacerbates the situation.
Ride like other people don't notice that you are there..... it's true; often they don't.
Make sure they have seen you, and that they know what you are going to do.... if they haven't and they don't, be prepared to evade.
Try to work out what they are going to do as well. Noticing their position on the road, the direction of their front wheels, behaviour in traffic, and so on are more important than indicator lights.
Know what is going on behind you; use those mirrors, your ears, and that glance over your shoulder.
That being said, there are places which do have a reputation for car drivers behaving aggressively toward motorcyclists. If so, adjust your riding accordingly. Forget being macho; bear in mind who is more vulnerable. Keep plenty of distance between you and an idiot driver.