Some people are misjudging the character of karna.
If karna was the one who gave the idea of disrobing draupadi in a mahasabha where bhishma, dronacharya were present.
The whole story of mahabharat will be a story of revenge.
War of revenge
When you are judging a character look for all the details before giving your opinion.
Some of them directly going to conclusion with only some pieces.
By saying karna gave the idea of humiliating a women in front of many people, directing it to question his character and his honor.