Sorry, but you don’t persuade me. He was responsible for dealing with viruses. He is Mac friendly and your inference is that he is not.
I'm responsible for dealing with viruses for my clients. That's the way I make a living. I own a business that specializes in support for small businesses and professional offices. I have both PC and Mac using business clients. NOT ONE of my Mac using clients has ever been infected by any type of malware. None of them are running cycle stealing anti-ware like Windows machines must to remain clean. Every one of my PC using clients has been impacted in some way by malware. None of the Mac using clients have. Those are facts.
Sorry, but persuading you is not the issue. The truth is the issue.
His claims about "just as many viruses attacking Macs as Windows," makes him a FUD spreader and someone who literally does not know what he is talking about. Facts are facts. There are literally over a 100,000 Windows viruses in the wild and over 300,000 total malware including spyware and adware. There are ZERO self-replicating, self-transmitting viruses for the OSX Mac. Even for the previous classic Mac OS (version 9.2 and under), there were only a total of 114 viruses! That is a fact. For him to claim otherwise is a lie or he is deluded. That makes me suspect his claim of owning a Mac "at home."
If he were working IT for me, he would be out of a job, spreading howlers like that. It would make me seriously doubt his judgement and analytical abilities.
Are there vulnerabilities that might be exploited in the Mac? Of course. Have they been exploited to cause damage to even a small number of Mac users—no. A few careless idiots downloading a video codec trojan from a porn site got their browsers' URL parser hijacked. That number is under 50 users. Not a virus. They had to download it, give it permission to uncompress even though the system was telling it was an application and not a codec, give it permission to install despite the system warning them again, and finally give it permission to run... despite the system telling them it was an application downloaded off the internet. That kind of stupidity deserves its fate. It is easily fixed by deleting one file.