It depends on the person who's about to talk cryptocurrency, some people just making themselves secret when talking about cryptocurrency. There are also some people who are just lazy to explain cryptocurrency to someone because of so broad crypto is and the risk on it as well because there are some instances that the one you talk about crypto will invest in bitcoin and once it goes down they will just blame you and will say that it is a scam, people or bitcoin investors won't want that to happen.
Even you are right in many cases, but we also have few other aspects as well as crypto is illegal in many countries, so peoples don't like to talk about this. In my case it's just I am very lazy to explain things just because of this mostly I never talk anyone I am in crypto mostly I introduce myself as trader in stock market or currency market.
In few cases we have too many peoples those don't like this all, so they also never talk about crypto and never give their identity as crypto investor or trader. Few feel not good about this as it's very risky, and they don't want someone lost his funds just because of them, so they never talk about crypto.