This happens in all fandoms I'm afraid. I'm a big fan of a certain TV-series that has existed for the longest time (since 1963), and the sourness, negativeness, cruelty towards certain actors, storywriters, etc. among so-called fans is just as harsh. Granted, it's not along National lines but there've been some really bad vibes among the fandom. I pick my forums and social media (definitely not twitter) very carefully.
I was surprised at first to see the exact same thing in FS but then I realised this is probably the nature of the beast, in this case fandom. And the only thing I could advise any skater is either not to be too active on Social Media because the experience can be harrowing or to just ignore the hater posts (which isn't easy especially when you're young) and enjoy the positive and compassionate ones.