Don’t believe us
The rich parents have done all this, solved the problem by giving Earl whatever he wants, medicated him, allowed him all this freedom— they don’t want to believe that despite their best efforts Earl still isn’t okay. This life is supposed to be perfect. They’ve given him the very best in life, and they don’t understand why he still acts out, brings girls home, makes a scene and causes trouble. All this anger stems from the parents never being there, never really talking to the kid or knowing what’s going on while they’re gone. The parents can’t believe Earl since they don’t understand, and they don’t want to believe it anyway.
In the previous line, he says “Brash as fuck,” meaning downright fucking rude and assertive, is probably in reference to the activities taking place in the first few lines where his character is a kid acting out at the fact that his parents are pretty shitty. “Don’t believe us” is him daring them not to believe that he won’t do worse shit to get their attention. Good breeding (affluence) don’t mean that the rich are brought up right, or that they can’t get mad, even if they do have everything their maddeningly superficial peers and parents think a human could possibly require. This is pertinent set-up for Frank’s final verse, with regard to its theme of threatening suicide.
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