I think the meaning was that Windows is a malware ghetto compared to Mac. More akin to a Doctor noticing that 95% of his patients are blondes and declaring that

I think the meaning was that Windows is a malware ghetto compared to Mac. More akin to a Doctor noticing that 95% of his patients are blondes and declaring that blondes tend to get sick more. The significance of this is offset by the base rate though: unlike Windows PCs, blondes don't constitute 90% of the sample group.