Racist (3.5e Trait)
From D&D Wiki
You find your race to be immensely superior to one or more other races.
Benefit: Choose a race other than your own, you gain a +1 bonus to your attack rolls when fighting a member of that race. You also Gain a +1 bonus on Intimidate checks against the chosen race.
Drawback: You take -1 penalty on Bluff, Diplomacy and Gather Information checks when dealing with member of the chosen race.
Roleplaying Ideas: Your character is always weary of the people of the race he hates. He is likely more hostile and more uncomfortable around members of these races.