Don't be. You feel that way because you think the total amount of BTC which is paid for pizza with today's value of BTC. If you think differently where the price of BTC that day is different to this day. That time 10k BTC is worth around $40 compared to this day's BTC price so that's why the buyer didn't feel bad or disappointed. So, today if someone wants to buy pizza and they accept BTC then you won't have to pay 10k BTC just to buy pizza but rather pay BTC that is worth the pizza let's say $40 and that would be 0.0013 BTC.
I am pretty sad when many people keep repeating the story of Laszlo Hanyecz when using 10 thousand BTC to buy 2 pizzas. I don't know what are they thinking? Because I bet those people that, even if they knew about bitcoin at the time, they wouldn't have dared to invest in 1 bitcoin, let alone own 10 thousand BTC. The early adopters of bitcoin made history, what they did is the foundation that we are here today, without those transactions, there wouldn't be any crypto market until now. We should show them respect and gratitude rather than mocking them.
actually, every one have their own choice with different reasons to use bitcoin as daily use payment. In my point of view, i choose to store bitcoin in my wallet (holding) and some of my bitcoin will be traded on short trading, then after i get some profit i usually withdrew the btc to fiat before use for payment on daily purchasing.
Nothing wrong with laszlo that he bought pizza for 10.000 btc, it was his choice to do it. No one knows exactly what will happen in the future including the price of bitcoin will rise or drop.
It is true that bitcoin has been generating profits for investors. But bitcoin was initially created as a means of payment, and it can still be used as a form of payment today. You are right, everyone has their own choice, not everyone considers bitcoin an investment, and many people are still using it daily instead of fiat. So there's nothing wrong with someone buying Pizza with bitcoin or using bitcoin for everyday spending. Bitcoin is very flexible, and what we use it for is up to each person, no one is wrong, and no one is right here.