The first thing that came to my mind after reading this was that one should not talk about his crypto investments with strangers or friends as it can pose various risks.
It really depends on the person and their friends, when it comes to friends. Strangers, you're right. I don't know why anyone would flash their crypto holdings to strangers. Pretty irresponsible.
If you are active on forums like bitcointalk and involved in trades, you should not give information which can help others relate to your identity.