They're well organized, very popular, and just generally really good at what they do. If you don't want to play by their rules, for whatever reason(s), then don't. Just don't be upset by the fact that a good majority do. Some might interpret some Smogonites attitude about Pokemon meta-gaming as arrogance, but you have to realize their opinions are quite well founded...
Y'know, most people against Smogon are people who are upset by the fact that they ban certain things and create sets that are widely used which "takes the fun out of the game". Frankly, these people are idiots who don't understand what the concept of meta-gaming is. Things are banned when the meta-game begins to centralize around them. There's a difference between setting up your 6 Pokemon team so it can deal with the top 20 or so Pokemon in their respective tier than having to dedicate a Pokemon and/or your stragety to dealing with just one. And sets are created to correlate with the usage statistics. Some Pokemon has a lot of Special Defense EV investment on it's more defensive sets? There's a reason for that. If you actually played their meta-game, you'd probably find fairly quickly that it's needed to take hits from certain threats that would otherwise wreck it. Oh! But what if I find one of the sets to be obsolete compared to my own? Well, pat yourself on the back, that's meta-gaming: designing your stragety to deal withthe the environment. Smogons sets are simply platforms, albiet very good platforms, but platforms non the less. They're open to your own improvement and alteration. Never once have I met a Smogonite who believed Smogon's sets to be the truth to solving world hunger and complete and utter perfection. No, generally they share my opinion on the matter, that opinion being that you should run the standard sets unless you can come up with something that actually WORKS, and not just be different for the sake of being hipster. That's not meta-gaming, and you will fail. I promise you, that you WILL fail if you do that... in other words you're gonna have a bad time. And yes, Smogonites will look down on you for being a hipster.
And that's all I have to say about that. If you don't enjoy it, just walk away and let those who do carry on with their own buisness. They're not hurting anyone or anything.