I put Sophos Free on the ms. Mac some years ago. Then out of the blue last week got an email fron Sophos saying my 30 day free trial had expired.
Please, dont listen to people who are called "geniuses" as a job title - if someone at Apple actually said that to you then that is outrageous. Apple OS' are indeed less susceptible to viruses/malware etc - in comparison to PC i'd guess at 99 to 1 but they still are vulnerable to threats of various natures! However an Anti Virus these days is not just that, it protects you for a multitude of things from browser plugins, malicious files like Macros embedded in a harmless documents, website spoofing and I even think that the crypto viruses hit Macs too (could be wrong) - I am sure some of the IT guys from larger companies can chime in on more horror stories. Point is, have something, free or paid but just do not have nothing regardless of PC or MAC. I have nothing against Macs before the usual PC vs Mac arguments inevitably start!
Spoke to apple their staff are of the opinion if your mac is up to date you don’t need to add AV
Yes its technically the enterprise version, but I expect the product is effectively the same, just a different endpoint software on the client.