There's legions of programmers out there using Windows. Just because they choose to operate on a MS OS/stack doesn't mean they're not worth targeting or reaching out to. Beyond just this fact, you need to think about the future - when you were young, how did you get started programming?

Javascript is spreading to more and more devices, and being the main language of the web browser environment doesn't hurt this. I'd wager it definitely doesn't hurt to be able to install Node on a Windows machine if you're a new programmer and want to get into programming.