I think in 30 years you will regret it.
You need to live though, and not spending money to buy food will not allow you to be alive in 30 years.
I think it's better to be alive than dead with Bitcoin.
It doesn't even close to 30 years, without foods you're only survive for a month

If he's saying spend Bitcoin to buy a pizza is wasting money, he should realize he's also buy foods with his money, where the money can be used to invest Bitcoin lol. No one should regret if they spent Bitcoin to buy a thing because that's what Satoshi Nakamoto's aim to create Bitcoin, it's used as a currency.