I obviously don't think Linux users are idiots to be weeded out, but not knowing how to use Windows or MacOS in a pinch might be problematic for you at some point.
Professionally, I might recommend staying with Linux as your daily driver, but also branching out just to say you know the key differences between the OSes and how to be productive within them. This could help to prevent a situation where your dependence on Linux becomes a liability or roadblock in your career ("I prefer Linux" vs having to say "I can only use Linux").
From a development standpoint, Windows has been doing some cool stuff too - Windows Server Core for example. All my servers are of course running Linux, but my work desktop is running Windows, which I happen to prefer for productivity. Many of my SWE colleagues develop on Mac laptops, and leading UI design tools like Sketch only work on MacOS, so it looks like we're not getting any closer to a single-OS landscape in our industry.
Professionally, I might recommend staying with Linux as your daily driver, but also branching out just to say you know the key differences between the OSes and how to be productive within them. This could help to prevent a situation where your dependence on Linux becomes a liability or roadblock in your career ("I prefer Linux" vs having to say "I can only use Linux").
From a development standpoint, Windows has been doing some cool stuff too - Windows Server Core for example. All my servers are of course running Linux, but my work desktop is running Windows, which I happen to prefer for productivity. Many of my SWE colleagues develop on Mac laptops, and leading UI design tools like Sketch only work on MacOS, so it looks like we're not getting any closer to a single-OS landscape in our industry.