Nothing hypocritical about it. It's me finding one thing funny and another thing not. Toilet humor is generally thought of as anything having to do with poop or fart jokes, and those have nothing to do with dick jokes. And for what it's worth, I'm not even a big fan of dick jokes, it's just that dick licker is an insult that I barely ever hear, and if said by the right person (since how funny a joke or put-down is depends on who's saying it and how they're saying it), it can be funny.