I disagree - maybe because I only perceive speech as "offensive" if it's directly insulting to a targeted person - which impersonal jokes (whether "dick jokes" or any other jokes) are not. In any case, I would rather err on the side of freedom, allow most communications (except insults, secrets, and whatever is illegal, such as hate speech), and rely on people to proactively say they are uncomfortable with something. I understand that not everyone wants that, but then again, I would prefer to not have to wear a suit to work, while others might. We just won't work together.