Jimmy stole $14k from his own family and indirectly caused the death of their father.
Chuck worked his butt off to become a highly respected lawyer and a partner of a firm, and Jimmy got his law degree through an online program; Jimmy thought that made them peers, when it seems like it made Chuck almost embarrassed to be in the same profession as Jimmy.
Jimmy's methods/morals are shady at best, which are the complete opposite of Chuck's "straight as an arrow/the law is sacred" personality.
Jimmy has also just basically become a boss at a law firm, so once again like the law degree, Chuck might take it as another thing that he had to work his butt off to achieve, but Jimmy just does this on a whim and thinks "now we're equals" sort of thing.