This is silly, F# has never been more of a first-class citizen. It's explicitly part of the .net core distributions, part of the nightly testing and validation cycles, and is in the TechEmpower benchmarks.
Or type providers in .NET Core.
Visual Studio 2017 has even been released with critical bugs in F# tooling, as they weren't considered as show stopper.
In regards to VB.NET and C#, it certainly feels like second class, and occasionally even C++/CLI gets more love.