Called out by the real winner
Not even mature university students are exempt from lying on social media for the likes. The uploader of this image says he turned his head to see whether he was in the lead. In other words, he stopped mid-race to check on the other swimmers. After all of this, he still managed to win!
This is when the real winner entered the chat. The guy in lane two (whichever that one is) is about 20 yards ahead of the original poster. Lying on social media will result in other people calling out your nonsense.