If as you said, you are not willing to use bitcoin in public, it means that you do not want people to know you are a bitcoin investor. If everyone is like you, how can bitcoin become a currency, a means of payment when everyone hides that they own bitcoin? We always want bitcoin to become more popular, always want people to know more about bitcoin, but meanwhile we are afraid to use bitcoin or spread bitcoin to others. How can bitcoin become popular?
The truth is that, despite the fact that we all want to see bitcoin getting global recognition and acceptance, doesn't mean that we would want to risk ourselves especially in countries with very strict regulations against bitcoin and cryptocurrency in general.
And with that been said, I wouldn't have to blame the woman because she made her exchange physical and obvious and I also wouldn't expect the woman to ask her customers the source of their wealth before trading with them because I believe bitcoin is decentralized and as such she wasn't expected to ask her customers how their bitcoin is gotten because there are people who earn and own bitcoin genuinely and I think the security officers were to rash with their decisions.
If your country's government has strict and nasty regulations on bitcoin, then I agree that we shouldn't risk spreading bitcoins to others or regularly using bitcoins. But if your country has regulated and legalized bitcoin, then we need to do something to make bitcoin more popular. Don't be too selfish when we always say people should disseminate information about bitcoin while we keep it a secret from others. Many people are doing this, they often go on social media to urge people to spread bitcoin to the people around to make bitcoin more popular, but they are not doing it because they think they need privacy, and that is selfish.