Not letting BP up's the only way to live, though I continue to refuse to pass them on the right. That positively encourages their negative behavior. They learn that by slowing down the annoying person in their rearview will magically go away. They've learned that's how driving on expressways works. I stay behind them, a safe enough distance, but in their rearview. They need to learn how to drive; after all, it's not like they don't basic rules, unless perhaps they're from another country where rules are different or don't exist.Yeah, when you're behind someone in the left (i.e., passing) lane, and they're going slow, and you begrudgingly move to the right to pass them, and suddenly they're hitting the gas, not wanting you to pass. And if they succeed in cutting you off (which is very seldom, with my Little Red Beast), and you have to pull back behind them, they slow down again.
I don't waste ire on them, but I do resent their very existence at that moment.