Men have higher threshold for offense than women

Live Science - Study reveals why women apologize so much

In a series of small studies, conducted only with university students, researchers found that both men and women (self-reportedly) apologize about equally when they recognize that they've done something wrong. Further, in a subsequent study, men (self-) reported taking less offense, or thinking an offense was less significant, than women did regarding the same action. The first study found that women did apologize more, and (self-) reported committing more offenses than men did. (Most of these studies were conducted over a ~2 week period, asking subjects to keep diaries.) With the two studies taken together, researchers speculate that women apologize more because they are more sensitive to offenses than men are. Men may have a higher tolerance for some offensive actions, and thus do not see them as offensive and do not believe an apology is warranted.