Do you think this makeup artist making a white girl black is racist?

[Anomalocaris]

No, it isn't.

Is it racist when black people make themselves look white?

You have to ask Michael Jackson.

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I think whether or not black facing is offensive depends on whether the intention is to mock what may be considered by some to be less comely or flattering aspects of stereotyped racial appearance or demeanor.

If not, then no, it ought not be construed as offensive.