Things that only work if everyone thinks they are real ARE social constructs. Money is the best example of these. But some pretentious people just LOVE to feel smart by saying everything is a social construct like it is some profound insight that we would all be in awe of.
"sociologists use to legitimize their expertise and colonize other fields of inquiry that were traditionally the domains of philosophers and scientists. The whole thing is just repackaged Marxist analysis of everything as a social relation."