The ironic sayings for this situation are as follows:

1. "Drinking water without thinking about the source, and being a person without gratitude." This sentence satirizes those who enjoy the kindness of others but have no gratitude. .

2. "If a person is ungrateful, he is a tree without roots and water without a source." This sentence implies that people who are ungrateful lack a foundation and cannot last long.

3. "Ingratitude is worse than lying, vanity, pretentiousness, drunkenness, or other evils that exist in the hearts of vulnerable people." This sentence emphasizes that ingratitude is a serious evil behavior. .