I used to buy a coffee from time to time with bitcoin.
But I can't use bitcoin buying a coffee now, because the fee is so high, if I keep 0.0001 fee like before, it would take days for the transaction to get confirmed, I've got a transaction which took 11 days to get the 1st confirmation last month.
It's not cost-effective any more to buy (I mean both online and buying face to face) thing via bitcoin. And this is why I quit buy coffee with bitcoin.
If I were you,I wouldn't waste my btc on buying a cup of tea.Who knows this cup of coffee will cost me thousands of dollar in future like the 10,000 btc.
Use bitcoin for bigger transaction or better hold it.
Speaking of the matter, he want to spend his bitcoin as normally as it should be, it's normal, you can't consider it's as a waste whereas bitcoin was first made to be a currency for spending and not for investing.
Probably you're right that in the future we might see that bitcoin would skyrocketing its price but still it's a right thing to use your bitcoin for a cup of coffee.