The fact is, Most of these people don't even know what being mature involves, it's like when you're little, You play doctor, when really, can you perform a quadruple heart bypass?
These people need to realize. being "mature" is not great, doesn't get you anywhere, in fact, in can make things worse. Sure, there are times when you have to be mature, and us "immature" people know these, and can be, when the need arises.
So please, don't tell me I'm being immature, cause otherwise, I will react correct to your statement with a nice and prompt: I don't care, Whatever, Fuck you.
Immature and Happy for it.