The key word here is “ineffectively.”
I have no problem with someone holding a door open for me. They hold it open, I thank them, life goes on.
But something I have noticed recently is that some people are excessively and ineffectively holding a door open to the point they are actually not helping anyone; they are just getting in the way.
It depends on the situation—and even the physical nature of the door itself—but generally it’s a situation where the other person’s arm or even whole body is in the way of me actually getting through the doorway. Their basic physical presence makes it impossible to pass and they seem to not even move even if I grab the door and hold it open myself.
Typically I say, “It’s okay… Thanks…”—or non-verbally indicate, “Nope! Thanks!”—in hopes of getting the other person out of the way so I can actually pass them. But in some cases, people don’t understand they are being ineffective in their efforts and might even take my dismissal as being “rude.”
For context I am located in a major city in the northeast part of the U.S. Verbal or non-verbal cues are fine.