Isn’t this just a simple case of “get the moisture away”? Blowing into the dishwasher doesn’t move the moist air away, it just moves it around in the box. Blowing out pulls the moist air away from the dishes and out into the room.
If your box fan was pushing dry hot air (like a hair dryer), hot enough to meaningfully speed up evaporation, then blowing in would probably be better.
Sadly some people think “revenge” is a good enough platform to qualify sometime for the top office. As long as the revenge is at least pretending to target people they already don’t like or that they’ve been programmed to think had wronged them in some way.