Don't gossip about your co-workers. It's unprofessional and can lead to unpleasant situations.
Accept the fact that you may not like everyone with whom you work, and that they may not like you. Then pull on your big-kid pants and maintain a relationship with the disliked co-worker that will get the job done.
Don't criticize someone else's work unless you are that person's supervisor. However, politely pointing out errors or making suggestions is okay: "Chris, you misspelled the client's name here." "Amy, I've found it helps me to rough-draft the memo first."
Accept the fact that things may happen at work that you don't like. Then pull up your big-kid pants and decide what to do--quit the job, accept the situation, work constructively to change the situation, etc. Foot-stomping and temper tantrums will win you a place on E-Hell, but not in the hearts of your bosses and co-workers.
Every workplace and every job has its share of drudgery and scut work. Do your share without complaining.
Watch your alcohol consumption at office social events. It may be a party, but you're still at work.