Earlier quoted context omitted.
I couldn't disagree more. You lose nothing if I too wear a tartan pattern, say. You're just being mean. FWIW it's a stage toddlers go through, not wanting other's to use what they use or do what they do. Assuming you're USAmerican, USA has "appropriated" the scientific culture of Russia by also going to space; appropriated the beer making culture of Europe; appropriated the Television/Computer culture of Britain; the…
Did you miss this bit? "The transmission of culture between peoples should be based on a mutual interest in sharing and learning, not some sense of global entitlement."
If something in your culture benefits me, why does my use of it have to be dependent on that also benefiting you? Indeed if its a loss for a small people group but a benefit globally then surely that's a positive thing.
Would you for example argue lack of distinctiveness as a negative thing, in which case you could be blocking all sharing by demanding "mutual interest".