If you owned a house in 2008, I assure you, you'd feel that your mortgage was real debt.
Or if you ever got laid off.
Or if you ever got injured or severely sick and found yourself with shocking hospital bills.
When life hits you with something like that, suddenly that monthly payment, and the risk of foreclosure, bankruptcy, and severely damaged credit, all looms large over your head like the Sword of Damocles.
Yes a mortgage is real debt.