I enjoy mocking my friend's baby
Why would you mock your friend's baby?
Because my friend is being so annoying about his baby problems that I have to do that to shut him up. Besides the baby is ugly.
It's not right to mock a vulnerable person like a baby when they have nothing to do with your anger. You should speak to your friend about over sharing with you and get on the same page.
Why should I care?
He would stop being your friend if you continue mocking his baby.