In order to call yourself a capitalist, you have to own capital.
It doesn't qualify if you have a mortgage to your capital or debt to your capital. You have to own the thing or property outright and completely in order to say you have capital.
The majority of us are not capitalists because we don't own capital.
We may advocate for it but it's like arguing for your banker to stay perpetually wealthy and even more wealthier through your debt.