I'm merely saying I defy
anyone
to deny me goods when I present cash as payment. CASH is a method of
payment
and if that is all I have, then I don't believe they can deny me the use
of
it in paying my debts.

Cash is legal tender for settling debts public and private. That's the law.

Actually cash can be refused if the face amount of the bill is large (although
nowadays $100....the biggest bill in circulation....is not terribly large), or
if the vendor does not have change (taxis, street vendors, etc.). Possibly
counterfit currency can be refused also

The "legal" solution is to pay the $100 (for instance) and return later for
your change; that way you get your goods when you need them. Not convenient,
true.