The reply to these fools must always be something like
The Supreme Court, the law that governs you, says it is a tax. The IRS which can jail you and strip you of your posessions, is legally bound to enforce this tax. For you to stand there and say it is not a tax carries no more weight in the face of law than saying trees drive cars. Both are figments of a delusional imagination and play no part in the reality we live in. If you want to look like an uneducated fool, that is your choice.
Just hammer them with the fact they look ignorant to their friends and they will quickly change their tune or shut up. Because appearance is everything to these idiots. Substance matters not a whit.
Or a tax. Oh, wait...
Your post is exceptional. It would be nice if some Congress critters would start executing that strategy.