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Agreed MTB gets more of a pass with colours all over the place, same as BMX. The thought of white rims on a road bike though, hmm....and I say that as someone with a bike with white hubs :)
And when you said gold rims I thought that would be considered a one way ticket to anti, but I looked up those Mavic's you mentioned and I can see those working with some builds. Agree dark grey can get a pass too.
In some limited circumstances you might get away with gold anodised (e.g. Mavic OR10). Dark grey hard anodising is obviously fine. I'm not entirely opposed to white paint on MTB rims.