What is an example of irony in the short story Two thanksgiving day gentlemen by O'Henry?

An example of irony in "Two Thanksgiving Day Gentlemen" is when the wealthy man invites the old man to a lavish restaurant for Thanksgiving dinner, only to be embarrassed when the old man reveals he has been feasting at a soup kitchen. This situation highlights the contrast between appearances and reality, showing how the wealthy man's generosity is based on assumptions that ultimately prove false.