What ? I developed web applications with Clojure/CLJS Python/Django, I did C++ development for years and a large part of the code in my current project is in Python because the tool we use (Blender) uses Python as a scripting language.

I agree that .NET has less opensource tools because a lot of things are just provided by Microsoft out of the box, and there are many areas it's not popular - but there are many OSS projects and they match the things I saw in Python and Clojure community.

I would say his posts proves another point - a lot of people in open-source are unfriendly to .NET because of Microsoft origin and they like to spread FUD. I remember when Mono was getting started and every thread on every news board would bring up how it's "patented/copyrighted" even when Microsoft gave .NET community patent promise and made CLI a standard.

When I contributed patches to Mono and talking to other .NET developers on social networks I never saw this "unfriendliness towards OSS".