I go to a gym class three times a week. The best spot for the class is the front row on the right hand side of the instructor. No spot is reserved. Whoever comes to the class chooses her spot. But there are a couple of women behave badly. Whenever they arrive they just put their mat, coat or other belongings on the spot, regardless of whether it's been taken or not. If I insist that I had taken it and I arrived first, we would end up in an argument. But they have been taking it for granted. It's no big deal but it does leave an unpleasant feeling. Am I being petty? No one else has bother to have any conflict with them.