I think that is exactly the point. I think there is a gut reaction against saying that all DD donuts are kosher (well, all ones that get from regional bakeries that are kosher).
It seems so funny to imagine that there is really all this kosher food all over the country that we didn’t know about.
But I think that’s all it is. Because I frankly haven’t the slightest idea why you think I should be worried that the server’s sleeve hit a piece of bacon and then happened to brush my donut in a way that is nosein taam, and that the concern is strong enough that it makes it assur.