Don't lie or make personal insults when arguing with people. It turns a conversation completely pointless.

Don't take your emotions out on people around you. Explain to them you are having a bad day, and apologize in advance for any "shrapnel" they get hit with from your emotions.

Don't make people clean up after you (unless it literally their job, and even then, minimize the impact) because you are an adult and don't need to live the life of a perpetual child.