DEI is fun and games until I am the person that won't be hired because I am not the niche to be de-discriminated. I remember coming to a Google stand on a conference, where they gave me form asking besides my email address, what is my ethnic background (strange word they used in my language, which I associated with gender etc, whatever would make me a minority) and would I mind share. I chose not to share and they even didn't drop me a line...
Ya maybe cause you refused to fill out a form that everyone else could fill out just fine. They probably thought you couldn't follow instructions and thought if they can't do this why would we proceed? You ever consider that?
Unless you know more about that incident than the op, it sounds like they didn't refuse to fill anything but instead chose to skip and optional section.
