He sucked at it.

 I always fixed problems He created.

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 Many time's the computer problem exists between the keyboard and the chair (no matter what computer literacy they are) ... it dont matter if it's a MAC or a PC

MAC's arent effected by malware as often because they arent as targeted as much as PC's

Most viruses and malware just arent "compatible" with MACs. 

A "hacker" (as much as I hate that word, I'll use it here) goes for volume. Why put the effort into targeting MAC's when there aren't nearly as many of them used by the public.