heres a interesting quote from wikipedia:
"In practice, its use and meaning are heavily dependent on context. Presently, the word nigga is used more liberally among younger members of all races and ethnicities in the United States, although its use by persons not of African descent is still widely viewed as unacceptable and hostile, even when used without intentional prejudice. In addition to African Americans, other ethnic groups have adopted the term as part of their vernacular.
There is conflicting popular opinion on whether there is any meaningful difference between nigga and nigger as a spoken term. Many people consider the terms to be equally pejorative, and the use of nigga both in and outside African American communities remains controversial. H. Lewis Smith, author of Bury that Sucka: A Scandalous Affair with the N-word, believes that "replacing the 'er' with an 'a' changes nothing other than the pronunciation" and the African American Registry notes, "Brother (Brotha) and Sister (Sistah or Sista) are terms of endearment. Nigger was and still is a word of disrespect." The National Association for the Advancement of Colored People, a civil rights group, condemns use of both nigga and nigger.
Some African-Americans express considerable offense when referred to as a nigga by Caucasian people, but not if they are called the same by other African-Americans, or by some other minority, as a term of endearment. In this case, the term may be seen either as a symbol of brotherhood, similar to the usage of the words dude and bro, and its use outside a defined social group an unwelcome cultural appropriation. Critics have derided this as a double standard.
Non-rhotic English-speakers, for example many in Britain, pronounce "nigger" and "nigga" identically, as their accents do not distinguish between these two words."
I hope I didnnt offend anyone by posting this quote from wikipedia. These are not my words I just think it's very educational.