Can I be mad at my friend for being insecure?
That is strange. Why do you get mad at your friend for being insecure? Can you explain?
I'm mad at him because he gets mad at me for insulting him sometimes. I feel he's fake.
It is wrong to be mad at your insecure friends. If they need help you can help them by getting professional help or offering encouragement.
I am so mad. I can't even begin to tell you how much I want to kick him in the balls right now.
You need to calm yourself down. You getting mad is not going to make him less insecure. If you still want to be friends, just help him be less insecure.