Charr - Flame Legion, Ascalonian Ghosts and Separatists.
Sylvari - Nighmare Court.
Asura - Inquest.
Norn - Sons of Svarnir.
Humans - Outlaws.
I don't know why e.g. Ascalonian Ghosts are aggressive to other humans. I think they should be neutral to other races. I know Ascalonian Ghosts are "stuck in the history"; they think they're still in a war, so they keep fighting the charr... but why are they attacking humans?
Sons of Svarnir are corrupted/maybe out of their minds/they're fanatics, so I understand they can see others as enemies.
Bandits are aggressive to everyone because they're bandits, they just want your money and stuff. It's normal.
I don't know why Inquest members hate everyone. They would kill you everywhere just because you saw them collecting mushrooms for their experiments. They can be spotted mostly around their labs, but not always.
Nighmare Court... I think they're just evil.
Flame Legion... I have no clue why would they fight everyone exept charr and humans (because of history).
As I know, e.g. Humans did nothing to Ascalonians, Sons of Svarnir, Inquest or Nightmare Court.
Commander, to ME!