Someone on the page I found that on suggested a wicked thought.
It depends on everybody in the office/at the worksite/etc. knowing about the Call in Gay Day.
Then, if the homophobes at work were to somehow all come down with an otherwise mild intestinal illness that causes bouts of diarrhea throughout the day -- on THAT day...
Can you imagine the mental stress over whether to call in sick or not, with them imagining that other coworkers will think them gay if they don't come in to work?
=K