I would guess many 20-somethings have recommended a mac to their parents with this as one of the bullet points. At a time, it was more or less true - when dropping a virus on your windows PC was as easy as loading a malicious activex website, macs just didn't even have it. Not to say macs weren't vulnerable, but the attack surface was lower and the cost/benefit to people trying to bot-net your mom's Mac was higher than everyone's unpatched Compaq running Win98.