No, the other one.
Anything about negative opinions tend to attract a lot of negative opinions in a way that's not wanted on the wiki, to put it mildly. People start complaining about those negative things, and then other people start defending them, and then the first people get upset that someone actually dares not hating that, and so on. We've seen it in several different ways before, and most of the pages that have been tagged as Flame Bait have had severe problems with this kind of complaining.
As a sidenote, gushing can also cause those kinds of problems, but due to being inherently about positive feelings, it tends to not be quite as toxic. Also, liking things is what fans do, and the site is largely for fans.
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It needn't be something in the page's description. Topics dealing with evaluation of fanbases are often contested. The one you mention is quite harsh.
Obviously, a fandom topic does deal with 'positivity.' Nonetheless, where fervent opinions - for or against - are mentioned, there tends to be a lot of passion and conflict. Further, adding examples probably constitutes an attack on or defence of one fanbase, in an explicit way. Thus the caution around them.
edited 16th May '18 2:24:31 PM by zeroflyingwherever
"Hello. Casually, tell her that she's died."
Yes, I know some people do try to defend the work, but I'm not sure about the actual fans being involved to defend their work, as they may be too divided on their own issues, to mount a counterattack.
edited 18th May '18 12:29:03 AM by AppleGates
No, the other one.
There's no cooperation needed. Everyone for themselves. There is no "being too divided to mount a counterattack". People have their opinions, and they attack with it.
edited 18th May '18 12:52:53 AM by AnotherDuck
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I know it either attracts a Flame War or Complaining, but I don't know what (the content of the page itself) makes that those kind of pages are a complaining magnet or attracts Fan Dumb?