The simple fact of the matter is getting kicked for sub par is unfortunately the real world. But the real world generally doesn't equate to mature.

A "Real World" player will say I don't like this and get rid of what they don't like.

A "Mature" player will say I don't like this therefore I will leave as I am the one with the problem of not liking the situation.

Obviously we can tell which group the kickers fall into.