I'm not entirely sure, but I think that I have reported him at least once in the past for trolling and to my knowledge, he was not banned.
the user kiklo
https://bitcointalk.org/index.php?action=profile;u=357609 used to only spam his FUD about bitcoin in altcoin boards but he is expanding his teritory and is now spreading
false information, lies, FUD,... about bitcoin all over the forum while advertising his altcoin in his signature space and also in his posts.
The forum doesn't have an exact stance on these matters, therefore it leaves users a lot of *room* to troll/FUD before they ban them.
I'm not exactly sure whether a negative rating is the best course of action here. There are more qualified people to elaborate on that one.