These characters are for children at the end of the day
If Cyborg was always regarded as like he was in Teen Titans or TTG then I have no problem with this. He would be akin to a little bill or craig from the creek There's nothing for a child to look for in regards to harmful interpretations of media in that way
if the character is marketed towards adults like the majority of these characters in comic books then it's time to have a different type of discussion

For a long time DC and Marvel and even indy publishers got away with a lot
DC has a long history of not being conscious of their minority heroes
I wouldn't doubt Johns isn't conscious of this at all because he's for the majority of his career avoided using minority heroes. For Ray Fisher to challenge him its sort of like Cyborg figuratively coming out of the page and questioning why he's doing this to him.