Company holiday parties can be SO amazing if you work in a healthy environment. When your coworkers are petty, managers entitled, and HR useless, then holiday work parties can turn out to actually be a huge source of anxiety. Take this recent employee who came to vent on Reddit. She was having a normal day at work until she stepped out to refill her water bottle and came back to an empty office. She looked around and found only one manager still there. She asked what was going on and the manage…