A more thorough explanation:

Term: e contra
Definition: E contra means "on the contrary." It is used to show that the opposite of what was just said is true.
Example: "I thought the movie was boring. E contra, my friend loved it and thought it was exciting." In this example, the speaker is saying that they found the movie boring, but their friend thought it was exciting. The phrase "e contra" is used to show the opposite opinion.