I need an explanation.?

That's a legitimate point, it's not racist. You're right, you can change the wording around to refer to different countries and races, and suddenly it would be a huge concern. It would sound like a KKK website! Why can they get away with this? Because the white people are perceived as the better race. Think about how many negative stereotypes and bad words exist for white people, very few. What effect do racial words against whites have? Very little. The N word can easily start a fight, but everyone just laughs at cracker.