No darling, I read those comments and if someone had to post something like that on one of the books you put time and effort into, you would be upset too.
You're right, destructive criticism is wrong - but you're so very quick to post hurtful critique yourself. It's a case of not being able to swallow your own medicine. Some people actually use writing fan fic as an escape / break / improvement technique on original work. If you're going to tear someone down for using the full creative control we have in writing, then don't read it and certainly don't post snarky commentary for people to see - address the writer via pm.
Lasty, I'm not looking for honour. If anything, I'm standing up for someone as close as family to me whom I care for dearly. Yes, it's a personal thing so be careful what you say.
You are a new user so here is some genuine advice, not meant condescendingly - If you don't like what u read after a few chapters stop reading and don't post untoward comments as it will lead to people more horrible than myself saying a lot worse.