There are a couple different "personalities" I see in MMORPGs or games like Pokemon with very interactive, MMO-like qualities:
1) There are people who want to win or do well in the most efficient way possible, without regards to creativity. These are the people that pick the best gear (Or pokemon) and constantly find ways to make a sleeker, streamlined, more efficient team. They find beauty in doing better and better.
2) There are people who want to have the most creative, diverse team that they conceived by themselves. They don't value wins as much as using their favorite Pokemon/weapons/whatever, and prefer what's cool to what is effective. They find beauty in innovation.
They are always thought of as competing views, yet they are both just means to enjoying the game. You cannot win an argument between these two. You cannot say "Using your favorite pokemon is idiotic and useless" or "Using an unoriginal team is bland and lame." They are just worldviews, personalities, moods, however you want to think of them.
To tie back into the message I quoted: The people who are disconnecting on you have absolute no fucking right to do that under the pretense that "I don't like his cookie-cutter party" any more than people would if they DC'd with the thought that "I don't like his weak, kiddy team." This is not Nazi Germany or Soviet Russia, where the rules people lived under are evil and inescapable, and need to be changed. The GBU is a metagame you go into knowing that 600 BST Pokemon, OU Pokemon, and the like are all allowed. Don't be a prick and DC on folks like Iamslow.
You don't truly appreciate creativity if you're the person who needs a sparkling wincount for self-validation on a team that you "made in the spirit of innovation and originality" You're not any different in that case than the guy who doesn't have any qualms about running a team full of the 600 club, except that at least the person who runs the super-OU team isn't lying to himself.
EDIT: To clarify, I am not specifically a sympathizer with the "efficient, sleek" crowd. Most of the teams I have made have been made out of gimmicks and favorite Pokemon. But it disgusts me to see people thinking that that is the only way, that people who like efficiency are inferior and inherently poor players.