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Correct, but my point being is that a windows PC is not instantly a typhoid mary just by virtue of its existence. @dumastudetto's suggestion of putting them on a separate network is frankly a bit silly.
Agreed, yes. There is frankly very poor understanding of what is and isn't relevant in system security, and even if it were correct that Windows is sufficiently flawed to treat it as a Typhoid Mary, if one then assumes Macs are far superior and more secure, there clearly isn't a need to segregate them. If Macs are no more secure and thus need this segregation, there isn't a superiority to claim in the first place.

It's tribal nonsense, based on a small amount of reality, and a large dose of mostly unwarranted repetition.
 
Some folks are misinformed about the risks that PCs present, and conversely the relative safety that macOS presents. There is malware for both platforms, and regardless if you're on a PC or a Mac, practicing safe computing habits will largely allow you to avoid such problems.
 
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