Favored enemy or special enemy does not = hateful raging bigot. Just to clarify, when a ranger encounters his favored enemy he does not turn in to a beserking mad idiot filled with rage. My ranger is quite the opposite, he becomes very focused and cunning, relying on his skills in battling those select foes.
What it represents is a creature that the ranger has lots of experience fighting, or has decided to hone his fighting skills required to combat that creature.
For example my ranger character has orcs, giants, and (evil) humans as his favored enemies. He has spent lots of time fighting orcs, giants, and evil men such as bandits, brigands, Dragon cultists, Zhentarim men-at-arms, etc.
It doesn't mean he hates humans, or hates all giants. But he does have quite a disdain for evil giants, and I have to admit he doesn't like orcs one bit. They're evil, they are usually up to no good in the wilds and hence they are a true enemy of his.
But none of this means squat. The bottom line is he knowledgeable in how to fight giants and orcs, and against many of the evil men he battles, they see him as a deadly foe who can cut them down quickly.