Whether irony is a sin?

Objections

Objection 1 : It seems that irony, which consists in belittling oneself, is not a sin. For no sin arises from one's being strengthened by God: and yet this leads one to belittle oneself, according to Prov. 30:1,2: "The vision which the man spoke, with whom is God, and who being strengthened by God, abiding with him, said, I am the most foolish of men." Also it is written (Amos 7:14): "Amos answered . . . I am not a prophet." Therefore irony, whereby a man belittles himself in words, is not a sin.
Objection 2 : Further, Gregory says in a letter to Augustine, bishop of the English (Regist. xii): "It is the mark of a well-disposed mind to acknowledge one's fault when one is not guilty." But all sin is inconsistent with a well-disposed mind. Therefore irony is not a sin.
Objection 3 : Further, it is not a sin to shun pride. But "some belittle themselves in words, so as to avoid pride," according to the Philosopher (Ethic. iv, 7). Therefore irony is not a sin.