I am often late, but yes, this would have been very hard on me. Its one thing for me to do it to myself, but for someone else to, idk. Do you think he was trying to teach you a lesson? I have had family members try to teach me a lesson by doing or saying things back to me which they felt insulted by (but not necessarily HURT by? Idk), when i did them first, like being late, or not offering to share something. Foolish me, i dont usually make the connection until a few years later (seriously!). So these little feuds can drag on for literally years.