AIBU to thinks it's not funny. it's plain rude and shows a lack of respect for the other person?
I often see/hear about people who are always late and it's as if it's just a funny trait of theirs. I don't agree it's shows a lack of care for other peoples time. Are these same people always late for work/school runs/other important commitments or do they suddenly manage to organise themselves and be on time.