Harassment is an ever present issue. Just today we had a player actively belittling people in Bismarck hard mode for ridiculous reasons and making a distraction of himself as a result. Ended up wasting everyone's time and was kicked from the group, but not before the damage was done. The harassment is at its worst where players are most likely to fail, so places like "The Endless Blue" are likely targets.

My advice for everyone is to take a strong no tolerance policy towards personal attacks as well as criticism that amounts to personal attacks. If you see it, start a motion to dismiss the player before any damage can be done and get a new guy.