To begin with, what does it mean to have an antagonistic personality?

People who qualify as such usually intentionally engage in rude, biased actions and behaviors, thus wanting to distribute negative energy to the people around them. 

How do you know if someone has an antagonistic personality?

According to psychologists there are 7 main qualities that distinguish antagonistic people. 

1. Wildness

They do not worry at all about the feelings and problems of others. They are extremely cold and stiff.

2. Hostile

They are always angry and irritated, especially when they respond to jokes they do not like.

3. Manipulative

They like intrigue, play with the behaviors of others, want to influence and control.

4. Rogue

Antagonists are not honest, sincere or open to different situations. 

5. Demand attention all the time

They become part of a certain group just to get the attention / admiration of others.

6. The delirium of greatness

They believe that they are superior to others and that they deserve to be treated as such.

7. Suspicious 

They overload themselves with the suspicion that someone intends to hurt or offend them.

Source: Psychology Today