The Linux Desktop Evangelist believes that this demonstrates that Linux Desktop is not difficult to use, but what it actually demonstrates is simply that Linux makes a really good appliance. As long as you don't ask more of it than one or two carefully accounted for use cases, you won't see a problem. Attempt to step out of the box though...
Do you have a concrete use case where Linux fails and Windows succeeds?
For instance, if I say I do something requiring an application for which there is no good OSS equivalent you'll tell me it isn't Linux's fault companies don't port their software to an OS with ludicrous levels of fragmentation that break compatibility nearly every release.
I have been in this argument many, many times over the past 2 decades. It is always the same. Deny there are problems, suggest insufficient alternatives, even recommend just changing their use case entirely. Anything to avoid saying "yeah, Linux actually isn't good for that".