Here's a fun one... how far do you take your hatred of someone when it comes to fan fiction? (ie: Leighanne or even a BSB fan).
Figured that would bust out the clowns and rainbows.
Not far, it's just fiction. So you know whatever happens it's not real. At least, as long as you portray the person realistically without making anything up about the person in question. I would never make up stuff about anyone and put it in a fic. If I write someone in, I write them true to life. What happens after that is purely fictional, though, obviously. I'm sure some may or may not like what they see about themselves of course.
Though... it does lead to the quote in my siggy.
"Don't annoy the writer. They may put you in a book and kill you." - Anonymous
It's well known that authors write what they know at least somewhat, whether it's places, or people. Sometimes in a flattering way where good things happen to the person, sometimes bad things happen. Well known authors do it, as do nobodies. Otherwise it wouldn't even be a quote.
It's harmless really.
For example - in a round robin parody, Nick dies in every chapter. Do I hate him? No. Do I want him to die? No. It's all done in humor and fun.
Isn't that the point of fiction?