You’re holding everyone to the same standard: Don’t be a racist asshole, but you’re treating people differently depending on how they meet that standard.

Don’t self-censor the way you want to! Self-censor the way I tell you to!

That’s still just a filter. A filter is something that separates and divides a mixed group into specific categories. So a reverse filter would be the opposite of that. Something that takes separate groups and mixes them together.

Strainers and sieves are filters. A filter is a filter. A reverse filter is still a filter. Direction doesn’t make a difference because direction is subjective.