Typically I am in the right-most lane. I was taught during drivers education that the left lane is for passing and that you should move back over to the right-most lane whenever possible, especially if you’re a “slow moving” vehicle.

But there are drivers who weave through traffic whenever they see an opening and those are the ones who appear to be angriest when they’re behind me in the right-most lane because they were impatient in the other lanes.

I don't think every state has this law.