The best teams have the best players along with a great coaching staff and a professional and efficient organization that knows what it is doing backing the players and the coach. Bruno is a refreshing presence because he is so good at actually kicking the ball bit, mengi seems to be an obnoxious little cnut who given his own performance in the game needs to improve himself instead of trying to pick fights with others.
Winning mentality isn't hate everyone you play against, giving 110% and still being friends with someone who you play against aren't mutually exclusive. The team did not lose because he posted a picture with a friend before the game nor did it lose because he was friendly with the opposition player, otherwise it would be a draw as the same logic should apply to the chelsea player. We lost because we played poorly and by the looks of it, the big culprit of that was Mengi himself, funny how all that i hate the opposition mentality of his didn't help him perform better.
The best teams have the best players and the biggest winners off them all, not only talent to kick a ball, I think you fail to realize that. Bruno is refreshing not just because he is a good footballer, with his attitude he sets standards and wants everyone to strive to get there. That's what winners do, winners don't tolerate shit from teammates, and you as a United fan should know that, our greatest ever captain was the definition of winning mentality.
Winning mentality doesn't stop him being friends with whoever he wishes for, so does not posting a picture in inadequate time for himself and his team. And don't mix winning mentality with hate, nobody said you should hate your opponent.
Posting a picture can never lose you a game, especially a game that played out previously, it's a nonsense sentence you wrote, and completely off point, it's the mindset that we talk about, the Chelsea player won a game 6:1 against one of his biggest rivals, not sure what you are missing here. We lost because Mengi was absolute shit, so were number of other players, including Mejbri, you don't lose a game 6:1 because of one reason.