in my country when someone asks me about bitcoin i always tell him the basics and i don't say anything about me and the bitcoin i have, i prefer the person to buy and hold, so i teach him only how to buy and do hodl and the risks of losing everything and I tell you to do more google research, the problem with that in my view is that when they lose money they tend to blame the person who pointed them out or taught them that's why I stopped talking about bitcoin in my country, even when the person comes with desperation and asks me I don't tell him anything. In my country, saying a large amount would be the same as asking to be kidnapped, I just told my family. I even admire some people who keep posting luxury on social networks, it looks like they are not afraid of being kidnapped and killed
Money is a very sensitive thing, they will not know friends, relatives or even family. There is a saying that "money is the sharpest breaker" be it with friends, relatives or even the closest family members. So it is not recommended to say the exact value of the money we have, be it in cash or in the form of assets, in this case bitcoin or altcoin. I hardly say what the exact total is in my investments, and if anyone asks me what my total assets are, I'll be joking. This is my way of protecting myself personally from things that are not desirable as the OP said for example. Because we don't know what other people think of us, it's not our negative thoughts about them, but rather anticipating things we don't want.
One has to be very careful when someone else is asking about assets or earnings. Like if some close relative is asking, you can say to them that I will not tell you. You cannot be harsh to them as it will break relation. There are other practical ways to avoid giving them this information. Like you can tell them that you make as much as Warren Buffet. So you are just making a sweet joke to them and avoiding the question with a smile. They will also take is supportingly. If some distant relative is asking or just a casual friend has interests in your assets, you should clearly tell them that this is none of their business.
this depends on the degree of kinship, you will not say to your father, mother and brothers "I will not tell you" if they ask you questions, even because they are right in you to ask questions, imagine that one day you arrive home with a car luxury you bought with bitcoin and they ask you questions, won't you tell them the truth? if you don't tell the truth they will think you stole the car or money and went to buy the car
