Cuz people (white people) that usually point out racism everywhere, love to find a way to make something about race.
I refer myself as colored, cuz i'm colored, my skin is brown, more precicely, like a milky cofee, also because there are a lot of white latinos too, latinos are a multi-racial comunity where 70% of the population (being conservative) has mixed race.
Black people speak the same type of english.... but their pronunciation is diferent, they drag words and mix sounds, or idk how to describe it, they smooth the vocal transition from one sound to another making it really harder for someone who is not native to understand. But that's for the average black, not for the ones in movies.
Also, fun fact, japanese has almost the same phonetic atributed to letters as latinos, so, latinos and japanese can read words writen of each lenguaje almost perfectly without even knowing what they mean. thing that is noticed in anime:
Look at the first 15 seconds, notice how he says "hueco mundo", perfectly pronunciated in spanish, that anime particulary, has a lot of spanish words implemented on it, all perfectly pronunciated.
Also, japanese phonetic structures are limited, really limited, they have to literally learn how to make new sounds to learn to speak and hear another lenguaje, even if they can write it perfectly, and they have a hard time doing it, and the things that i pointed out before about black people's english can make it really really harder to a japanese speaker to understand.
Notice how literally pronunciates "the world" as "Za warudo"
Notice how they pronounce Mcdonalds. "MAKUDONARUDO" Maku = Mc Donarudo = Donalds.
Also, there is even a parody of how they pronounce words in english
https://youtu.be/zhGnuWwpNxI
they also have problems with another lenguajes:
https://youtu.be/7JfV2Hk_AGg?t=34
while i, speaking spanish can learn to make that sound in like 30 seconds, a japanese person would have to literally re arrange the way he speaks to be able to learn to pronunce that wods.