That's optimistic. It is true that most problems with viruses and worms affect Windows computers, but no software is bug-free and both Apple and third-party developers of Apple software have to regularly add security fixes. There were already viruses for the old macOS and due to the high popularity of Apple devices nowadays, they are increasingly targeted by attackers. Until now, OSX seemed to be largely spared, but discussions about concept viruses as well as "intrusion tools" for OSX systems are circulating on relevant Internet platforms. In addition, certain macro viruses for Office and a variety of sniffing software are already running under Apple.