Arguing a point based on what Jesus, allegedly, did not say betrays a misunderstanding about the Bible that so-called “red letter” Christians seem to fall into. The mistake is thinking that red-letter verses (the words of Jesus) have more authority than the rest of the Bible.
Our doctrine of Scripture entails that all the holy writings are “God breathed.” Therefore, Jesus’ words have no more authority than Jude’s, and Paul’s words have no less authority than Christ’s. In fact, since Jesus is God and God inspired all of Scripture, Titus’s words and Paul’s words are, in a very real sense, Jesus’ words.
So when someone makes a claim based on the silence of Jesus, simply say, “Jesus never said anything about that? So what? Let’s look at what the Bible does say.”