In the WordPress Codex, the description of the function
get_the_category_rss() is described as
All of the categories for the current post in the feed loop, will be retrieved and have feed markup added...
However, it's not just retrieving the categories of the posts, it's retrieving the tags I've associated with each post too.
Is there a different function available that I could use in my feed-rss2.php file, or a hack that I could implement that would output only post categories to the WordPress rss2 feed?