These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Fan Community Nickname - According to Sulli's me2day update, it's "plus", but a lot of f(x) fans are unaware of this, so it's not commonly used. The fans are usually given the misnomer "Aff(x)tion" - it's the name of the fan forum, not the fanclub.
Some of the fans started calling themselves nameless or f(nameless).
Fan Dumb: The group's fans have been called out for lashing out at rookie group Red Velvet, claiming that SM was using them to "replace" f(x). It didn't help matters that the group had only been formed shortly prior, and they debuted almost immediately after Sulli made her hiatus announcement.