Apple told people for almost ten years (both on their website and in their retails stores) that "Macs cannot get viruses." They act like that wasn't a big deal.
The number one source of viruses on a Mac is anti-virus software, don't install it. No system is impervious, there are levels of risk. Apparently the highest possible risk is running a stock Lenovo.
I imagine that comment referred to fake antivirus software from webpage ads or something that users are tricked into installing. Something like ClamAV would be fine.
