He'd probably start thinking that just like Batman replaced him with a new, said-to-be-better Robin, he also replaced his broken Batgirl with a new, improved model, and be furious on Babs' behalf.
He'd also say to Cass pretty much the same things that he's telling Mia re: mentor as a father figure.
I don't think he would read class issues into it, but given that Jason's class issues are intimately correlated to his Bruce issues, he certainy would find a way to make everything be all about 'Bruce is a nasty selfish bugger who's never gonna do anything for you'.
Meanwhile, Cass would see right through his bullshit and feel sorry for him and kick his ass when he tried killing people and start bringing him snacks. Because he's family! And he wants to be Robin! And then she'd kick his ass again when he started going after Dick or Tim.