The most passive aggressive character in the show is Lip. Passive aggressiveness can be associated with pettiness, and Lip is definitely petty. He is in a relationship with Mandy for most of the show; when she becomes upset about somethings stupid, he gets upset about something equally stupid just to prove his point. He avoids the conflict by behaving aggressively but without making it blatantly obvious. There isn’t a specific example for this because Lip uses this tactic multiple times when dealing with Mandy.