You are expected to congratulate the winner of a competition.
Dave's teammate wins a swimming competition and walks up to Dave afterwards.
Dave wants to talk to his teammate who won the swimming competition.
Dave congratulates his teammate for winning the swimming competition and tells them they deserve the win.
Dave talks to his teammate about school and doesn't even mention the swimming competition.
Dave's teammate thinks Dave is being supportive of them by congratulating them for winning the swimming competition.
Dave's teammate thinks Dave must be jealous of them because he didn't congratulate them for winning the competition.