You don't need to be stressing yourself about the idea some newbies have about Bitcoin. Most of these people don't bother to read that is why they will keep asking funny questions about Bitcoin and how they don't find it too appealing. Everyone has different opinion about Bitcoin and since it's their personal opinion, there is nothing bad about that.
Who is going to teach the newbies if you dont do that? I see your point but the main reason why we have this knowledge is because someone was willing to share it so its in our position to do some, even if its not mandatory.
Anyone that still don't understand what really application Bitcoin has should take a quick look at the Bitcoin white paper so that they can have an obvious understanding of what Bitcoin is and some of these applications. It has bring about a revolution that can not be halted.
I believe there are more than enough resources online for newbies to learn. Its just that, most of them are reluctant to do research before making assumptions. It wont tear a piece from their flesh.