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Most times it's just better you maintain some privacy because it hard to trust people these days besides most people here in Nigeria are brainwashed that all people that are into cryptocurrency especially Bitcoin are fraudsters, they know little of the world of bitcoin so they can say shit about it and you announcing yourself as a Bitcoiner can make the situation worse.. they aren't gonna believe you but try changing your mode of dressing too
And again you actually owe no one any explanation about what you do and besides if we really look into the whole thing at hand I think staying private would actually benefit you more than actually letting people know that you are into Bitcoin cause just like you said the whole society is brainwashed to the mentality that Bitcoin has to do with scam@yahoo boys, but little did they know that it's actually cryptocurrency especially Bitcoin that's ruling the world now.
It is interesting to see the same or similar mentality voltage concerning this topic (haven read through)... Like Mr. Suevie said, you owe no one explanation, if policeman make them come first (that's if some jealous and not tired to be jealous people makes a report accusing you to be fraudulent)...
So I think the answer is yes and no... Yes to deserving people in your life and that is if need be (some parents, siblings and relatives would want to clear all doubts) .
And bloody no to anyone, mostly those who loves to see you broke, talkers tempting you just to hear what they'll say about you etc