Read: Luke 10:13-16
"The one who hears you hears me, and the one who rejects you rejects me, and the one who rejects me rejects him who sent me." (Luke 10:16 ESV)
Sharing the truth about Jesus is guaranteed to set you up for opposition. There will be people who do not like what you have to say. There will be those who disdain how you say it. There will be many who simply reject the notion that God holds them accountable for their actions. Acceptance and rejection are staples of Christianity.
Even in your own journey through faith you must ultimately decide on the ideas which you will accept or reject. Theological questions, life issues, and other things to be wrestled with internally have to pass through the filters in your mind until they are received or they are rejected. Jesus himself must never be rejected. He tears through all internal filters and ideas. He is the main idea.
As the seventy-two sent ones travelled the countryside sharing the message of Jesus they faced rejection. There was a crooked religious heirarchy that shunned them. There was an occupying pagan force that ridiculed them. There were their own countrymen that misunderstood them.
Jesus prepared them for that eventuality. He told them that people would reject them. His point was not that they were rejecting the disciples so much as the fact that they were rejecting God himself. To reject those sent by Jesus is to reject Jesus, and to reject God. The wonderfully encouraging idea in this is that it also means that by accepting those sent by Jesus, you are accepting God.