In a recent conversation a young feminist student of mine said she wasn't going to get married because marriage is a social construct. The assumption implied was that because it was a social construct (not actually a necessity for pair-bonding and reproduction) that it must be a negative thing.
I told her that in my opinion it was a very positive social construct that had worked reasonably well for the benefit of societies for millions of years.
Borders likewise maybe man-made, just like toasters; but they both have their uses. Anyone who thinks that everything that is a social construct, should be de-constructed; had better get used to idea of living in a grass hut and subsisting on roots and insects.