On the popular comedy, "Seinfeld", Newman was the evil nemesis of the title character. He was a postal worker, and he was not a nice character. Often, he tried to foil Seinfeld's plans. Although he was friends with Kramer, he was not a good person. Also, he was very ugly.
Referring to the "Seinfeld" character. In the Bible we have a name for types like him. Part of 1 Corinthians 6:9 that I'd like to apply to Newman, "You know that wicked people will not inherit the kingdom of God, don't you?" He is one of the most evil beings in TV history. He's so evil you'd think he was one of Satan's used people. The deceit and the way he seeks to start trouble for Jerry and the gang and wishing them harm. Newman is an evil punk. A perfect Klan member he would have made with his hatred.
No, Newman was not evil, because he was just a character on a television show. No one should put too much significance in what a television character says or does. He was just a hypothetical character designed to be a caricature of people in real life. People should not get too upset about it.