Melanthius the goatherd kicks Odysseus. Odysseus practices patience and self-restraint and does not kill him.
Odysseus keeps his composure once again when Antinous throws a stool at him. He again practices more self control and doesnt kill him. This demonstrates a quality of patience and discipline he did not have too much of earlier in the story.
Odysseus again demonstrates patience and self control by only knocking out Irus, the town beggar. He could have easily killed him but chose not too.