Those who made the big decision to invest their money in Bitcoin last year will now have seen the value of their investment double in Bitcoin.
History never lies and we have seen how Bitcoin's 4 year halving cycle makes the price of Bitcoin soar quickly, and from OP's story, if only your friend had bought Bitcoin instead of buying expensive shoes or other luxury goods, his money would have doubled by now and he can buy more things, investing in bitcoin is really profitable, you have to be smart in managing your money, don't let momentary desires make you prioritize buying luxury goods rather than investing in bitcoin.
A lot of people don't know these things and they need guidance and understanding, however, they should be referred to places where they can learn more about Bitcoin and how it has been performing from the last decade and a half so that they can see how much potential it has and then maybe they will understand that instead of unnecessary shopping and buying branded cloths, shoes, and other stuff, they should invest some money in Bitcoin.
So, I don't blame them if they spend their money on such things because they don't know yet. However, if it's someone who knows about Bitcoin and is still doing that, then you can blame them for being careless and not taking a wise decision with their money and finances.