From TheGamer: “The Back 4 Blood beta seems to be a success. Fans of Left 4 Dead were happy to get back into the universe and murder hordes of zombies as the spiritual successor played pretty similarly to the original. However, while players enjoyed the death and blood, a few of them were left shocked when the zombies suddenly turned racist.”
Source: N4G PC WB Games Says Zombies Aren't Screaming The N-Word During Back 4 Blood Beta