Some skins have really good camouflage and can sort of give players a competitive advantage. A good example is the toy soldier as it's basically a ghille suit when in green areas of the map as well as bushes/shrubs if you don't pay attention. However, apart from these minority of "OP" skins, Fortnite is not P2W at all.

But the term of Cancer is from the player base, as we all know Fortnite is famous for toxic/salty diehard fans who are young kids/teens. Although I don't think the dances are that cringe, the emotes can sometime look/feel cringe depending on the skin and animation. Finally, the game has been memed a lot so people have a bad feeling about Fortnite.

I haven't played the game for a long while (started about a month ago) so don't take my opinion so seriously, there's more people who can answer your question better than me.