Those metrics are all aggregate ones. A group containing Bill Gates plus one destitute homeless person $1M in debt has great metrics of that sort. Total debt is a tiny fraction of total income. Income per person is huge, and doesn't stop being huge when you adjust for price differences or hours worked or anything else you care to adjust for. But that destitute homeless person with a $1M debt is still destitute and homeless and $1M in debt.

I haven't commented on "repayment behaviour" because your other comments don't actually mention that. Maybe there's something behind one of the links you posted that explains what you mean by it. I did have a quick look at the not-paywalled ones and didn't see anything of the kind.

(The above isn't a claim that actually the US economy is in a very real sense tanking, or that not-very-rich Americans are heading for destitution, or anything else so concrete. Just pointing out why the things you've been posting don't seem like they address the objection being made.)