For me crypto currencies are just another currency like US Dollar or the Euro and I would never share publicly how much Euros I carry with me when I am going out, or how much money I have in my bank account. These are private information that I might share with my closest friends and my family, but never publicly. Bitcoin shouldn't be treated any other way. What good does it do if we are open with how much money we have invested in cryptos? To me it doesn't seem that there is any benefit from it and only will make feel people bad or even risk our own health. The kidnapping story is a very rare occurrences and I wouldn't worry so much about it in my country. Here it's more about being polite to strangers, because we don't know in which financial situation they are and it would be wrong to tell them how much money we have. I can happily talk about crypto currencies without mentioning how much I have myself.
I agree with both of you, bitcoin is just money, nothing more, nothing less. So, this story will be more perfect if we say that we should not brag or share with anyone about our investment portfolio or assets. Flaunting our wealth to others puts us at risk even if we hold gold or fiat currency, not just bitcoin. So, even if someone does not invest and hold bitcoin, don't be foolish to share with others that we have a lot of money. But it's hard to understand why some people like to brag, what will they get in return other than danger to themselves?