If you mention it in anyway, "I'm reading xyz bitcoin book or doing xyz bitcoin thing," it usually leads to a discussion. Depending on the audience it may result in nothing more than their bitcoin diatribe, but sometimes its earnest interest.

Like you, I don't mention it unless it comes up naturally and I never directly sell it with you-shoulds. I've found that selling into people's biases is more effective than selling against them. I'll usually nod along to whatever their POV is - gently correcting any factual inaccuracies - and excitedly convey my oh-so-personal conviction.

When people are skeptical of something or suspect you're conflicted, the best thing to do is to let the product of your interest speak for itself. Suggestible people will come around slower but you'll avoid enraging the cynics and its way more healthy all around.