Blackberry: I don't know. I only know one person who has one and he's a workaholic so while the "snark" might be accurate, I don't think it automatically makes you look like a jerk if you have a Blackberry.
Bluetooth: I think some clarification is in order. Bluetooth is a great technology. One particular use of that technology is Bluetooth headsets for cell phones. Yes, Bluetooth headsets for cell phones are extremely annoying and make you look like a jerk in public. But they have their uses for those people who insist on using the phone in the car, or if you are playing games on your computer and need both your hands free.
But let's be honest here, shall we? You don't need a Bluetooth headset to sound like a jerk in public. Plenty of people hold their phones up to their ears while they talk in public and are still jerks.
TiVo: I'm not sure what the snark means. But I also don't understand how owning a TiVo makes you look like a jerk. I, personally, hate watching television and the only thing that makes it bearable is a TiVo. (In this case I'm using TiVo to mean DVR, much like how people often use "Kleenex" to mean a "blow-your-nasty-snot-out-of-your-nose-and-into-your-hands-tissue.") TiVo is a big deal to me when it comes to TV. It's almost the only way to get me to watch TV.
Apple's MacBook Air: Why not just say Apple's [anything]? I know this is a major stereotype, but it sure seems like the large majority of Apple users only use Apple products because it is fashionable or popular. Apple just exudes a certain air of elitism, even from their own marketing. It's not just the users, but the company itself that gives off this image: "I'm cool, fashionable, and good looking because I have an Apple [insert product here]!"
iPod: See the above.
Linux: I'm not sure about this one. It does seem somewhat true, depending. To use a high school analogy, people who use Apple products are like the Jocks and Cheerleaders trying to be popular/superior by showing off their fashion and money in a world of admittedly geeky technology, while Linux users can often be seen as Geeks and Nerds trying to be popular/superior by showing off their intelligence and computer mastery. While it is true that most people I know who use linux will make a snarky comment about its superiority over Windows from time to time, generally it seems the people who do that are doing it in more of a way that anybody who just loved a product and truly thought it was better would plug their own favorite product when the "competition" was mentioned. An example conversation:
Windows Guy: I just got a new computer and I'm considering whether or not to put Vista on it.
Linux Guy: You should put Linux on it. Ubuntu for the win!
Windows Guy: ... So anyway, [goes on to talk about the merits of Vista vs. XP.]
Linux Guy: [Joins in on normal, rational, civil conversation about Vista vs. XP.]
Whereas replacing Linux Guy with Mac Guy would result in something like this:
Windows Guy: I just got a new computer and I'm considering whether or not to put Vista on it.
Mac Guy: Microsoft is total garbage. I can't believe you actually bought a PC and haven't gotten a Mac yet! Macs are so much better!
Windows Guy: That's not true.
Mac Guy: Yeah? Well then how come there are so many viruses for Windows? Because Microsoft sucks (LOLZ)!
Segway: I've only seen these things in movies. People actually use them for day-to-day use? I can understand their use but they seem bulky to me. I'd rather go for an electric scooter, as in a relatively normal sized scooter (that you move by pushing your foot across the ground) but with a small electric motor on it. That way it's more compact and you don't run people off the sidewalk.
