Arguing with a fool?

– Mark Twain (misattributed), The Bible

⁴ Do not answer a fool according to his folly,
or you yourself will be just like him.
⁵ Answer a fool according to his folly,
or he will be wise in his own eyes.

http://www.full-stop.net/2013/08/23/blog/jett/never-argue-with-stupid-people/