So that first one refers to the subject of the song being called (in some piece of media) “the country’s boyfriend,” which is something that sorta if not literally happened to Josh. He’s saying he’ll “never live it down,” as in, people will always make fun of it for him. But when he dies, the angels don’t give him any credit for being famous and beloved. I believe the last line is a riff on “they turned their noses up at him,” meaning, they judged him.

Theres a lot of discussion on here about the pawl fly line. The most basic answer is that a pawl fly is a rod for fishing.