I work at a Certain Silicon Valley Tech Company and we recently had an employee fired for trolling.
Essentially, she claimed the right to park in handicap lots (despite not having children for "200 years"), wanted to bring her dogs to work (other people bring their "disgusting kids"), and complained she was severely overworked. Everyone on the thread posted pics of "facepalm" and inviting her to maybe not use the company-wide email list for such things, but she kept on trolling. The next week, someone commented on the thread to note she "no longer works here". Ouch.
Etiquette is as important for most jobs and human interaction as skill set.