What did the Undertale fandom ever actually do wrong?

Like there were some minor spats here or there, but I don’t recall it ever having a major scandal like SU or Bronies.

Whenever I ask people its basically amounts to “They made a shit ton of art and it as fucking everywhere and some of it had spoilers. Also all these bad AUs and porn”

and I’m just  “People making stuff you don’t like or making a lot of content doesn’t make a bad fandom”

That said I’m someone who doesn’t even believe in fandoms being bad.Any group of people can look bad when you look at them as a collective.