Apple, for all its great marketing, has some major problems in positioning, that's why they're doing the "I'm a Mac" ads. Those stereotypes have been around since System 7 - Macs are for graphics. That's based upon the industry positioning of more than twenty years! (Remember MacPaint and how much better it was than anything Windows had?) Then Macs have the "easy to use" reputation, which backfired because if you already figured out your PC, why would you switch to a Mac? Apple also tried positioning in terms of sheer power (Risc supercomputers) but that also backfired when the PowerPC chips didn't keep up.
Apple is now positioning its stuff in terms of design, creativity, and eye candy, which is good positioning, but they have a ways to go. Ironically this doesn't take into account Unix and developers, which I believe is a big reason for their success. A lot of people I know in the IT industry bought Macs because its a great Unix platform that still gives you a fantastic GUI- but then some abandoned it because it doesn't have as good Java development support.
In terms of what people think, seriously don't waste a lot of time caring about what people think, that gets you nowhere and forces you to live life by other people's expectations. But philosophy of life aside, just focus on your computer's capabilities - my Mac is virus-proof, my has fantastic ergonomics, doesn't crash, has tons of great software, runs a Unix OS, and always puts me first in line for new technologies like Airport, Bluetooth, DVD burning, Digital Photography, etc, and just frees me from the headaches and ugliness of Windows. I use my computer every day for the things that are important to me, and I bought the best one that was available to me at the time - an Apple Powerbook of course.