Yes, it seems likely to me that talking about underwear color would prevent some students from using the list and those students would disproportionately be likely to be female, based on my own experiences in engineering school. But I posted what I did specifically because I wanted to see if my suspicions were correct.
Some of responses in this comment thread look very much like blatant schoolyard bullying behaviour manifesting. "Why take things so seriously" "Spoilsport" et cetera ...
Partake in the hazing rituals, or else.
It's not like you have to be honest about what you're wearing, you could say any old thing - the email list police aren't spot-checking you to make sure you are indeed wearing yellow rubber ducky underpants.
I'm sort of surprised that there was not a sizable proportion of jokers that wrote-in "skidmarked"
Personally, as a previous member of a greek organization, I find the definition ridiculous as it would qualify having prospective members study/be tested on the history of the organization as hazing.
Try it work and see how far you get.