While it is true that gold has intrinsic value and is a trade good, it is important to recognize that Bitcoin has its own unique value proposition. Bitcoin provides several benefits that gold and fiat currency do not, such as decentralized transactions, fast and low-cost transfers, and a limited supply that cannot be manipulated by any central authority.

Furthermore, it is inaccurate to claim that Bitcoin's only function is to trade with other humans for their stuff conveniently without arranging a barter exchange. Bitcoin can also serve as a store of value, an investment, and a hedge against inflation. In fact, many people are choosing to invest in Bitcoin precisely because of its potential to act as a hedge against the inflationary policies of central banks around the world.

Regarding the argument that Bitcoin's value is based on confidence, it is important to recognize that all forms of money rely on confidence to some degree. The value of gold, for example, is also based on the confidence of investors and market participants. The same is true for fiat currency, which relies on the confidence of users in the stability and legitimacy of the government that issues it.

I would encourage you to consider Bitcoin as a legitimate option for trade and investment, rather than dismissing it out of hand as absurd or stupid.