To everyone seeing bad sportsmanship on twitter:
Please document the tweets (screenshots) and send it to their coaches/gym owners. Those are the people who should address it with the athletes/parents and who probably would want to know what is/was going on.
Because it was mentioned on the boards before I know for sure that Stingrays and Cheer Athletics do not condone that type of behavior and will for sure handle it. And there are certainly more gyms that feel the same way.
An additional thing to do: unfollow those people. What are those tweets worth if no one reads them?