How do you deal with argumentative or angry people?

Basically, argumentative people like emphasizing on a single point a lot. And its fine. Go one round. In fact, keep going in rounds until he/she realizes that the argument will lead to no where and stop. If it does not work, just change the topic half way to something silly, and then leave suddenly so the person can realize how silly the arguments were.

As for angry people, it depends on what type of character they have. If they are more submissive, just laugh and shrug it off. If they are really aggressive, then try your best to give in. If not, try avoiding sarcastic phrases that could anger the person even more. Maybe even find a chance, look at the person's face really close, then move away. that should dissipate some of the anger. Sorry if it did not help. You see, all these is from experience and television. Haha.