Discounting is the perfect word , as “accidental racism” lacks credibility as an argument to legitimize an attack on the characters and voice actors. None of the “racist” complaints have anything to do with race, but if you want them to be racist and you have the believies, you can make them so.
Importantly, you are ignoring that none of the fan complaints are about “accidental racism”, they are outraged by ostensibly conscious choices. They are assuming and acting upon the assumption these choices were made in bad faith. You’re changing the goalposts to “all racism is bad”, full stop. Which, yea, but nobody argued racism wasn’t “bad”.
Your arguments gel precisely with fan consensus: we don’t have much to say about a bland movie, so let’s complain about something we know everyone can get behind, regardless of its merit. At least we have a mob.