Was she a hypocrite for buying from state-run food depots when she lived in the Soviet Union, as well? Are free market advocates now obligated to starve themselves before taking money out of a system they were forced to pay into? That's quite a stacked deck of cards you're arguing with.

According to The Fountainhead, yes!

Observable reality and pointing out logical inconsistencies (hypocrisy) are generally considered fair game.

Truisms that assume the very thing under debate are generally considered not useful in moving a discussion forward.

The argument being that Ayn Rand paid into social security, and was therefore entitled.

Ayn Rand was not a Libertarian.