Don't like them? Why bother? Just leave them alone.
Do you really need to tell them? Can they change it?
Explain it as how you feel and not something they did.
slip it in the middle of things you do like
"We have to talk...about that thorn up your...."
"Hey Barney, I don't care what anybody says, you don't smell"
Be polite, talk slowly, let them know you are there friend and you don't wanna hurt them but its better coming from you then someone else
i love you, but, i dont like it when _____ is there a way we can work this out, if not i will acept you as you are <3
I'd be brutally honest with them