I'm going to tell my friend he is undateable and has a lot of emotional baggage
Why would you say something so mean to your friend?
I feel he wastes my time and is being annoying.
It is good to tell your friend how you feel if you have a problem, but you should be nicer about it. They might need professional help and you can try to help them with that.
I'm sure my friend is going to beat me up if I say that stuff to him.
As long as you are nice about it and make sure he understands exactly what you mean, I'm sure he won't get too angry.