Re: Speaking the copium
FOSS is certainly not all about supplanting Windows or proprietary, and the people who actually make it know that. However, to say that assuming it is misguided may be going too far. There are a lot of supporters of FOSS who do speak as if there is a struggle against proprietary versions. Whenever someone announces that, for example, a big organization is going to switch their desktops from Windows to Linux, people respond as if it's a victorious battle against their foe and that anyone who didn't do the same was making an obviously stupid choice because everything would be better if they did. People who watch this would be hard pressed to make that align with your characterization of "uninterested".
We know that these are often separate groups. The people who make this stuff are often not the ones describing unrealistic evil plots by Microsoft (it's always Microsoft, why can't some other company be evil some time) to ensure that Linux dies next year. Those who are not as directly involved in multiple parts of this may not understand this. Someone nontechnical recently told me a joke which, unfortunately, I can't remember well enough to tell in a funny way, but the point was that Linux users were more annoying than all sorts of stereotypically annoying groups like telemarketers and Apple users. Those who don't know us but know a little probably have a similar thought in their mind, and it will take more than your statement to prove why this is not the case. Worse still, if they see that kind of argument and try using it, they may conclude that not only are there a lot of annoying evangelists, but those people are wrong because they said that an insufficient piece of FOSS software was as good as a proprietary one and it isn't.