Giant infant
Adults who are self-centered, disobey rules and overact when things go beyond their expectations are called giant infants. Their irrational behavior always results in disastrous outcomes.
For example, in August, a man pretended to be disabled to occupy another passenger's window seat on a Beijing-bound high-speed train. His behavior drew fierce criticism online.
Argumentative person
The word represents someone who argues for the sake of arguing. People who are dubbed as a "Gang Jing" in Chinese take to the internet to argue or express dissent.