It's best to ignore it. This happened to my coaches a while ago. A girl (who left becuase she was mad that she wasn't placed on the level 5 team & had no level 5 skills what so ever) called my gym and my coaches out on fb. This was after I had stopped cheering. My coaches were cleary pissed, but only replied saying things like "it makes me sad that you would say something like this." Not only was the girl trash talking our gym, so was her mother! So my coaches kept it classy and my sister and I added the girl on fb, told her off for our coaches and then deleted her lol...and no our coaches had nothing to do w/ it. We just couldn't sit there and read that stuff about the gym we cheered at. We also included how bad it looked on the new gym that the girl was at because she was actually saying things that included her gym name beating our gym name. Funny thing is, yes she went to a great gym, but she still wasn't placed on a level 5 team. No surprise though.