Some people just naturally careless and they don't really know the implications of certain things that they do. It is a normal thing to expect such level of carelessness from these gen z, most of the things that they do is either due to ignorance or they are just trying to show off. If someone close to him probably you or any other person turned out to be as scammer he would have ended up losing his Bitcoin. It is important to always correct such people when we come across them because we might be saving them from future crisis.
When creating a new crypto wallet for the first time, as a newbie, the first sets of warnings you will get is enough to keep your senses sharp, it's either you do it or you lose your money, and if you don't want to lose money don't do it.
This person failed to followed the instructions that's been given by the crypto wallet itself, instead he chose to display is balance in the public? Don't tell me that this person don't know the implications, that's not the case here.
I think in his mind, he believed he has money, he is capable and he wants people to know that, this behaviour is popular with these Genz youths today, they do this alot even in my area, you can even talk some senses to them and they will take it out of you with insults.