I had my first meeting/practice today and everything went well. I was a little nervous at first considering I've never coached before, to say the least, an under 5 league. Everyone was really nice and supportive except for one parent who was extremely belligerent about how he had to break all these business meetings to get his son to practice and that he wasn't pleased that practice only lasted half an hour and that they are to be held on Mondays and Fridays. I had already changed the practice schedule 3 times already to accommodate the parents' schedules. He was flippant and rude. Basically, I had to go here to vent b/c I felt I did the best I could and that I shouldn't deserve to be spoken to like that. What should I do?