Harsh Language
Crude language has become pervasive, and it can be said that obscenity has "gone mainstream." People are quite casual about it.
The author seems to suggest you should avoid it in professional situations: being coarse and boorish does not contribute to a professional image, and it may be offensive or intimidating to others, especially subordinates.
EN: Considering certain words to be inherently crude or offensive is rooted in ethnic bigotry, but remains so pervasive in contemporary culture, even among individuals who are otherwise not bigoted, that it's worth considering. More importantly, consider the context in which these words are uttered: they often allude to sexuality, defecation, and other topics that are not appropriate, by any cultural standard, in formal discourse.