I see this as relative, because there comes a time when you can't hide it and it doesn't make sense. Think of Elon Musk or Jeff Bezos, for example. But without going to those extremes, it is not logical to have a net worth of $10M and live in a slum, hiding your net worth because it would be very dangerous if people in your neighborhood knew that you are rich. You can live in a neighborhood according to your economic level and drive a car according to your economic level, without hiding it.
The OP's case isn't that of someone who does not hide his wealth, it is that of someone who engages in stupid behavior. Letting on that you have a lot of money in a vacation spot, where you have traveled alone and are drunk most of the time is putting a bullseye on yourself saying "mug me" or "kidnap me", which is what has happened.