Gold doesn't claim to be a currency just as real as the Dollar.

You know, I'm willing to bet if you showed up at your local tax collector's with a large enough chunk of gold, they'd work with you.

Yes, but if you showed up in Tax Court with a chunk of gold, you would risk being held in contempt.

A 1-ounce gold coin issued by the US Mint is legal tender to the tune of $50. It says so right on the coin.

If you want to pay your taxes using gold coins, go right ahead. They will gladly accept it.