You've probably seen comments in people's blogs or whatever, along the lines of "Hey you with the laptop, you're in Starbucks, so stop pretending it's your office!" As if there were something inherently wrong with using a laptop in a Starbucks. I'm guessing it's residual "yuppie scum" resentment. But come on, be honest about it. If you hate that guy with the laptop because he's wearing an expensive suit and an even more expensive haircut and looks like he works for some huge soul-destroying conglomerate that crushes the working class under its giant oppressive boot, fine, but don't pretend it's anything else.
I mean, I like to sit in cafes and draw cartoons. If I drew my cartoons on a laptop instead of in a sketchbook, I'd hate to think someone would demand I stop "playing office".