One thing that concerned parents may wonder about with regards to Rudeness Rulez is just how rude is it? The only way to answer that is to list what I consider the rudest word in the game:
Booger/bogey, fart, bottom/butt, diarrhea, poo/poop, snot, vomit and pee/wee.
In my humble opinion, there are no words here that are beyond the knowledge (and use) of most children, and increasingly found in children's books. However, should any cards be deemed to rude, they can simply be removed from the game and humanely destroyed without affecting the fun.