This is a topic that's been bugging me for a while because when it comes to people who advocate for "social justice" it's commonly said by them that whitewashing is generally not a good thing (though at times claims of whitewashing will prove unfounded like in the case of Frozen, in which "social justice" types on sites such as Tumblr showcased their ignorance by not realizing the Sami people are in fact white, and don't actually resemble Inuit people when it comes to skin color [if anything this showcased racial ignorance by showing these groups apparently believe that "people who live in frozen lands must look Inuit, right?"]), but what about when people who complain about whitewashing basically do something like that when they give a "race lift" to a canonically white character?
For me it just feels like a major case of hypocrosy. If it's not right when someone makes a black character white in fan art, why isn't that same logic applied to when someone draws a white character to be black, Asian, Hispanic, whatever? Key word here is "canonically," because real quick I will say that if a character in question has no canon "human race" then this isn't much of an "issue" at all. (for example if someone were to do artwork of humanized versions of the trolls from Homestuck, given the trolls in canon are grey skinned aliens, doing "humanization" artwork of them really has no set basis on "who would be what race according to humans")
One good example of this was when I came across a Tumblr blog of someone who always draws the human characters from Homestuck to be black, even though the characters in canon are white, and how the artist has this annoying attitude of "my headcanon is the true canon and if you don't like it then you're automatically a racist so fuck you."