You were late it will naturally cause me to be unhappy with you. When I met u, u did not even apologise to me in person. In fact u did not even say a word to me when we met. If you still think you are right then go ahead. I was just giving an honest feedback about what I felt about u. If u can't take it, just don't be late. 15mins don't anyhow round down to 10mins.