Quincy seems to dislike SpongeBob. In "The Card," he seems to have dealt with SpongeBob before this episode and disliked him from there on. In "Model Sponge," Quincy does not like that SpongeBob makes a "Krabby Patty" out of money. He then fires him.
However, in "Little Yellow Book," he somewhat defends SpongeBob after Squidward reads his diary.
Quincy has only interacted with Squidward once: in "Little Yellow Book." Quincy repossesses Squidward after reading SpongeBob's diary. He seems to dislike him now.