PERMANENT 'Genre' deletion from tag

Is there a way to COMPLETELY remove "genres" as an option? I don't just mean being able to see it listed as an option, I mean if I open a file that already has a genre listed, after I change the tag to my specifics, when I save the file, the genre is completely deleted.
I know I can change it to "blank", that isn't what I'm asking. I want it to ALWAYS be blank automatically, EVEN IF THE PREVIOUS TAG has one listed, without having to change it every time and without having to have it in my preview plain.

The field definition for the Tag Panel allows to set a default for a field (see Tools>Options>Tag Panel).
There you can set also "<delete>".
The default value applies if you select more than 1 file and save the changes.