For me, this argument crops up on a near daily basis. The argument that PC Gamers are better than console gamers or the PC is better than anything else out there or that PC Gaming is inherently superior to everything else; not as a matter of preference but as if it is some written in stone conclusion that only silly people don't believe. In reality, it still just comes down to which do you like more.
I'm a console gamer - and by that I mean that I prefer to use a controller over a keyboard and that's as far as the preference goes. I have a laptop with decent specs and I play a great deal of indie PC games, mods, and go out of my way to try and pick up some PC only exclusives.
That said, the ID that console gamers have a lesser gaming experience because they aren't PC gamers is hokum. First it assumes that the average console gamer has one console and no computer. Why? Because at the end of the day, you only need a designated gaming rig to play a small fraction of PC games and a lot of those are even multiplatform - you can argue which is the best experience but then it usually again comes down to preference (first over whether that particular game is even enjoyable).
Second, with the exception of illegal activity (yes, yes torrents and such. I do it to, but when talking about which system is better, you can't really include stuff that's against the law because it's not a very far leap down the slippery slope to say "Well what if I rob a gamestop? Then I have games I'm not supposed to as well." It's a stupid argument yes, but the point is simply illegal activity is what you do with your system, not the experience it provides), in order to get the most out of PC gaming, you have to spend much more money than a console gamer would. If you have a really really good Gaming rig - like $1500-2000 - or even a pretty good one - $800-1200 often times, you can buy all three major consoles and several games for each; just for the price of the PC. If you buy a good gaming PC at the launch date of a console, they'll become useless at about the same time - average life of a console (at least this generation) 5-7 years. It doesn't lasts about the same amount of time and if you get all three consoles instead of the PC what you have is each access every exclusive that didn't get a PC port for each console (this year that includes LoZ, Uncharted 3, and Gears 3 among many others), a PC of your own to play low spec games, and the only major games you missed out on were RTSs, MMOs, and the occasional high graphics FPS.
Not to mention that PCs aren't one size fits all so if you want to play a game but you don't have the specs for it, your big budget computer is now immediately outdated. If you have a problem, it could be anything from the game, to a virus, to a hardware problem. Some games, even after purchase, aren't ready to go out of the box either - I know from personal experience (just using this as an example) Battlefield 2 uses an anti-cheating software called punkbuster and if you download the game from Steam, it thinks the Steam overlay is cheating software and kicks you from the game. Depending on if you are familiar with the problem or not and familiar with computers in general, it can take anywhere from 15 minutes to two hours to get yourself to a point where you can actually play Battlefield 2 - mostly because that's not the only issue with the game. Once you have it up, sure it's a great multiplayer game, but compared to the alternative where you just slide in a disc and within a minute, you're ready to go: standardized consoles definitely have a point to make about their simplicity.
Don't get me wrong; if you have to have only one - get a PC; for any price it has the best selection. But if you aren't limited to only one (which is sort of silly in most cases; why would you have to choose between a PS3 or having any computer?), the price of getting into it doesn't even make sense as a factual argument. Ultimately it will always come down to preference. "How do you like to play your games?" and "What type of games do you like to play?" I've got no problem with PC gamers that prefer playing on PC but it pisses me off to no end hearing PC fanboys jump into an equally juvenile "PS3 vs 360" console war and say "PC is better than both lololololol go home noob." and pat themselves on the back for a job well done putting down the masses of console gamers for their pitiful controllers. When you play only the PC you miss out on just as many, if not more exclusives than you would with simply one console and a decent PC, and you miss out on just as many potential genres (motion gaming and peripheral music gaming just to name a couple off the top of my head).
TL;DR PC Gamers that think they are better than everyone else annoy me. I find their argument very silly and often self-aggrandizing.