Interesting that the OP's supervisor assumed the negative when that wasn't necessarily the case. Sounds like she's trying to play good against bad Negra.
To the rest of the thread - I don't know about white women as a group desiring black women's bodies or "tan" skin (esp. since most BW aren't "tan" in that way
). That doesn't bother me because with or without their envy, I still love being a BW.
I'm going to say I think it is more of a one way street. Asians, blacks, non-white Latinos, etc. are privy to the glorification of a white beauty ideals. I don't see them trying to get kinky hair or rock NC50 foundation as much as I see Asian women rocking blue contacts, black women obsessed with straight hair, light skin, etc. etc.. I know few WW trying to marry black so they can procure "good" hurr, curvy bodies, or dark skin for their progeny. The vast majority of WW are not rocking butt implants nor lip injections and that is a fairly recent trend anyway.
So nahhh, to my view breaking it down to a "the grass is always greener on the other side" is a comforting oversimplification.