Mr. Cabal's lawyer was upset by the way you described his client, feeling that it was unfair and overly harsh. The description called his client "yellow-bellied vermin" and referenced disreputable conditions from Castro's jails, which seemed to be an exaggerated and unflattering portrayal.
The quote also mentioned the Mariel Harbor, implying a connection to a notorious period or conditions associated with it, further emphasizing the negative view of Mr. Cabal's background. This colorful language was likely seen as an attack on his reputation, provoking a defensive response from his lawyer.