Following post refers to user <o9ski> (not me). (At least, I like to think not me.) (But what if!)
That's not true. He (or potentially she) might just be genuinely disappointed with Macs. o9ski also posited a few very interesting points about how he's not a masochist, but his girlfriend is a graphic artist. We can conclude that some of the following is conceivable:
(1) Her art involves him suffering Mac hardware failures.
(2) Something about having a graphic artist for a girlfriend leads to buying faulty hardware.
(3) He is a masochist.
(4) He's really a sadist going for a BIG SURPRISE.
(5) His girlfriend isn't good at using Windows for graphic art, even though Windows is capable of doing just as well, if not much, much, worse.
(6) His girlfriend had a childhood traumatic experience involving windows, window panes, window washers, or Bill Gates.
(7) His girlfriend is relatively more masochistic, so he often has to assume a role he's not naturally inclined towards.
(8) Drawing the previous 7 conclusions was a waste of my time while I badly, badly needed to go to the bathroom.