A colleague I work with never seems to want to join in the general chat and laugh going on around the table during coffee breaks, but will constantly try to drag whoever is sitting beside her into a sideways (and usually much less interesting) conversation. I avoid sitting beside her as much as possible because of this, but AIBU to think that constantly trying to have private conversations with people who are obviously part of, and enjoying, the general chat going on is rude and selfish?