It's there, but it's not really addressed. There's definitely animosity and hatred between some characters, and between species and such. In a similar way, there's racial tension and conflict right below the surface in all societies, and sometimes it doesn't take much to reveal it. So it wouldn't be all too different to know that there are class, race, gender, species conflicts in the Star Wars universe. any time you have differences between people, all it takes is ignorance to spark racial conflict.