Just ignore duty finder players. That simple. Let them whine and play the way you want. They are not gonna pop out of your screen and punch ya. Worse case scenario your kicked-> just a few minutes until you are in a new group. And if your leader, kick em as soon as they open their mouth. After all, the fact it's so easy to get a group is why the DF players are so demanding, they know they can get a group in a few. So if you don't want to "speed" run then don't do it.