You know, some people say this, but give absolutely no evidence for the assertion. I use a Windows desktop and 2015 Macbook Pro daily (as well as Linux on servers) and honestly prefer Win10 to OSX. The file explorer is much more intuitive for me, it handles multiple displays much better, and obviously there's whole gaming thing.
I think some Mac fanboys probably haven't used Windows since Win 95, and still think it behaves as badly. It's like me comparing Win10 to OS9 (which was truly terrible - I had to suffer through that!)