While I'm sure not intended, this comment sounds quite sanctimonious. While I'm not the OP, I would say that the answer to your question is that it doesn't req

While I'm sure not intended, this comment sounds quite sanctimonious. While I'm not the OP, I would say that the answer to your question is that it doesn't require being intentionally cruel. People in general will (metaphorically) step on each other's toes from time-to-time. If a person is unwilling to apologize over even a small matter, that suddenly becomes pretty rude.