Wimpy The Workshop Rude and unfair

I had some business to work on so took my son and friends with me to Wimpy at the workshop. The boys asked if they could go play on the soccer table, to which I agreed. The supervisor, came, addressed my son and friends directly and they walked out. I enquired what the issue was, without asking she said that they are too big to play there. Her response : Hai, thry too big to play there, so i explained that they are 13. She said, No its 12 and under. Pathetic approach to children... Poor to zero mannerism. I just can't understand what the issue is since these kids went to play in an empty playroom, on a table soccer game, disturbing nobody....