No sense of humour

Oh dear. I think one of my fellow co. workers "idiots?" is definitely suffering from a lack of humour. In he meandered at 2.30 today he is not supposed to work on a Wednesday by choice and I am pretty damn sure today is Wednesday. So me being me I looked up and said "no point in meandering in now the day is nearly over" and instead of just ignoring me and carrying on, he threw a wobbler and walked out! either I am in big trouble for upsetting him or all the other "idiots?" will get me a thank you card for saying what they think.