Hope you were able to talked to those people who were speaking ignorantly about bitcoin this same thing you are telling us? Because I think they need it more than us here. As majority of us here are quite familiar and knowledgeable about these things.
There is no reason to defend Bitcoin, people are smart enough to look up Bitcoin if they don't understand the theory. If someone drops a negative review about Bitcoin, that means he already researched and have an idea about Bitcoin, which is the reason he refuses to accept that Bitcoin is worth investing.
Humans aren't the same and what looks approachable isn't to the next person. We have to remain Bitcoin enthusiasts while knowing that not everyone will accept Bitcoin, even for decades to come.