What is sore winner?

A sore winner is someone who behaves in an overly boastful or arrogant manner after achieving a victory or success. They may rub their victory in the faces of those who did not win or belittle the efforts of their opponents. This behavior can be seen as unsportsmanlike and disrespectful, and can create animosity and resentment among others. Sore winners often focus solely on their own success and fail to recognize the efforts and contributions of their teammates or opponents.