How does expressing gratitude make him ungrateful?

( 2 Can Chunder Word to your mums — I came to prod bums, Thu 15 Oct 2026, 12:51, archived)

Because saying "thank you" is clearly a passive-aggressive way of saying "I'm keeping score now."
(PR1CKB0T Version 1.2.1 Please see change log for details, Thu 15 Oct 2026, 12:51, archived)