I'd say that its fine for a person to choose to have an invisible friend(s) who tells them what to do, and how to think and live if thats what they want.
But I categoricaly do not think its ok for that persons invisible friend to tell me or anyone else how to live and think.
I do think its a bit odd that its so generally acceptable for grown-ups to have invisible friends who tell them how to think and live in the first place tho.....