I believe for instance that property is theft, as Prodhoun proclaimed.
The fact that we see housing as an investment is part, no, probably most of the problem.
But should you genuinely believe that and walk the talk, fair enough. I'm more of a pragmatist myself.
By "property", Proudhon referred to a concept regarding land property that originated in Roman law: the sovereign right of property, the right of the proprietor to do with his property as he pleases, "to use and [to] abuse," so long as in the end he submits to state-sanctioned title. Proudhon contrasts the supposed right of property with the rights (which he considered valid) of liberty, equality, and security. Proudhon was clear that his opposition to property did not extend to exclusive possession of labor-made wealth.
It's a social norm we maintain, with some limitations, because it's useful. It's not sacred.
When young people get hold of a home, then later sell it, none of them will be giving a "social" discount on the price.
Private property is private.