"CASUAL RACISM" is when somebody uses Racist words or phrases but uses it as a regular world/insult just like any other words or phrases, NOT directing it as an attack on other races/religion.
The people who use "CASUAL RACISM" don't use it as
intentional racial term, nor do they often have anything against other races and religions, but they use it as "normal" word or insult.
Often people who have Rap/Hip-Hop
influences in their life use this, mainly fans of Tupac, N.W.A, Eazy-E etc...
"CASUAL RACISM" is often picked up from
listening to Rap/Hip-Hop artists who use "Nigga" and such terms in their songs.
As a "normal" word form -
Hey Jamal, wassup nigga?
OR
"Yo Tom, did you hear Sam, he just said wassup nigga to Jamal"
"Yer Leon, i heard, thats just Sams CASUAL RACISM
coming out, it's because he listens to all that west-side rap!"
As an "insult" form -
"Yo Reggie, you
alright nigga!"
OR
"Hi Abdul, i heard
you stole a cake, thats a bit jewish of you!"