Why do people hate blacks?

I keep seeing the word "nigger" posted everywhere and it appears a lot of people here hate black people. Why?

I think a lot of those who hate or insult the entire people are trolls. Just saying group think things that either fall into the outrageous attention seeking / probing OR they genuinely believe all black people deserve hatred and their surrounding peers are influenced by a shown hatred.

Blacks are more proportionately hated for being different, higher crime rates, misunderstanding between cultures and language (even though they speak English), forced multiculturalism, one drop loss of European genetics. Etc.

To hate them all is unwarranted, but stereotypes are some what logical as a precautionary and 'not set in stone' first view point.