You could also argue that by pulling out a Mac laptop, you're sending out the signal that good design is the only thing you're capable of evaluating.
I agree that Macs are good-looking machines, and that OSX is aesthetically superior to Windows and Gnome/KDE, but surely that shouldn't be the main driver for choosing an OS or a machine over another?
There isn't a day that I don't wish my Linux desktop looked better, but I still use that over the Mac because I find it a better development environment, even if it doesn't give me a warm glow inside each time I look at it.