I didn't see this. While I believe there's nothing wrong about maintaining friendships throughout different teams, I don't believe in on-field fraternization between members of competitng teams prior to or during the game. The game is to be played to be won.

Even in little league while I stressed sportsmanship as a primary goal, I always instructed my players to wait until the game is over to exchange pleasantries with their opponents. Yes, they are your friends, but focus on the objective and your teammates during game time.