Firstly, I have to ask since these things are implicitly assumed to be bad, what is the smithsonian saying about the unspoken opposites.
Let's take time as a less inflammatory example.
Time in White culture is rigid, show up on time, and its treated as a commodity-which I assume means its value is assumed in how much or little of it there is. "There's little time to wait!", or "we have all the time in the world" being implicitly white notions of time.
Okay, if this is the case this means say African conceptions of time are loose and not commodified. Whether or not that's actually true is a different subject, the implication here is non whites either don't value time at all, theirs or others, or they see it as elastic and infinite. This would mean in African societies-no need to show up at a set time for your job, maybe don't show up at all, or show up I guess before the noon sun? I'm getting Uncle Remus vibes here-the relaxed wise black man who doesn't worry about being on time, and has no sense of urgency, and is at peace with the flow of the world and asks the young white protagonist, "what are y'all in so much a hurry about?"
Are they saying this is an innate quality of blacks or non whites in general? The implication would be Europeans and Whites take the passing of days seriously, and have a sense of urgency and social discipline, that non whites lack.
I'll leave other Sietchers to unpack some other aspects of this, but Good God if this is the state of American museums, we need to start considering other institutions to take pictures of T-Rex skulls.