"Denigrate" is a racist word.

Because you can't denigrate a nigger for he is already black
http://english.stackexchange.com/questions/209021/is-denigrate-a-racist-word

http://english.stackexchange.com/questions/51088/alternative-term-to-blacklist-and-whitelist
The feature for this was mocked up using the terms blacklist and whitelist. However, after a while someone raised the point that these terms could feel a bit controversial.

So far we've come up with these possible alternatives:

Blocked List
Unblocked List
Allowed List