People here (and fans of other teams too) seem to hate everything Barca-related, regardless of how far removed at this point. The nature of sports-fandom means schadenfreude is a common theme, and it's fun to watch Pep fail, or Messi fail, or Barca fail... but I can't say I hate any of them, or think Messi isn't one of the best players of all time, or Pep isn't a great coach, or Barca isn't the most successful team of the last 10 years.
I think it has a bit to do with their
Més que un club and just their overwhelming success in general. Paints a nice target.