Pretty much this. Basically it's like saying "We lost because of you". That's never a good feeling. And it will never elicit a good reaction from anyone. In reality, it is a team game, and it's up to all 5 to coordinate and get on the same level. No one admits "I am not good enough to carry others to win". It's easier to just pile the blame on o others. And that is a dick move.
I've been at both ends (telling and being old), but there is a way to tell people just as there is a way to handle stuff. I have relatively thick skin and brush things off and at the same time, if someone is messing up I just take the loss - because that is not going to change. Yes, I can't carry every time. I deal with that.