Is it ok to be insensitive to close relatives and friends in your writing?

Keith Richards, for example, called Mick Jagger’s penis tiny in his memoir.

I’m not talking about “My father was a serial killer” stories. If your father was a serial killer, by all means, destroy your father in your writing.

There are stories whose entire purpose is to document complicated family history. I think these are less controversial, though I’m sure the characters — if alive — experience mixed emotions. You have a certain life experience for which certain people were…