The point is not whether or not these people belong in heroic instances in their current gear. I think anyone will agree that someone in greens and blues should not be in a heroic instance. The point the Drama Mamas are making is that 1. you're downing bosses and 2. you're not dying. If either of those two points are true, who the flip cares? Is it so much extra work to "carry" someone in subpar gear?

Random dungeons with random people are just that. Random dungeons with random people. These random people are not going to make up your raids. They, in most instances, will not be your friends, merely passing acquaintances. Their gear or playing style is simply not your concern outside of how it affects your experience in the instance, and I doubt killing bosses and not dying is something to complain about.

Summary in three words: leave them alone. Stifle your ego and let them get their free badges and loots. And if you're feeling particularly kind, perhaps strike up a conversation about their playing style and give them resources, but do it under the guise of simply giving advice, not accusing them of ruining your day just because they do not have the knowledge or skill on how to press the right buttons fast enough and in the right order. It's simply the polite thing to do. Feel free to bash them mercilessly in private channels but don't be a jerk to them.

However, the minute their DPS becomes a hindrance is the minute you use the votekick.