"A social construct" and "not real" are not the same thing. Money, laws, countries, gender, even civilization itself are all social constructs. More importantly, all forms of ownership are social constructs, and that doesn't provide any information as to whether we should respect them or not.
Perhaps you need to look up what "real" actually means.
Inches aren't real. Laws aren't real. Language isn't even real.
Have you ever tripped over a line of longitude?
People live such abstract lives now that they're losing track of what is concrete.
> Perhaps you need to look up what "real" actually means.
On the contrary; I think. Nearly every definition disagrees with the claims you're making. It's not a mere synonym of "concrete" or antonym of "abstract".
https://www.merriam-webster.com/dictionary/real
And regardless, the usage here was clearly in the context of GP's (false) dichotomy between "real" or "false concept", so obviously the definition you're trying to prescribe doesn't apply.