1 Corinthians 1:19 "For it is written: "I will destroy the wisdom of the wise, and bring to nothing the understanding of the prudent.""
V20 "Where is the wise? Where is the scribe? Where is the debater of this age? Has not God made foolish the wisdom of this world?"
V21 "For since, in the wisdom of God, the world through wisdom did not know God, it pleased God through the foolishness of the message preached to save those who believe."
V22 "For the Jews request a sign, and Greeks seek after wisdom;"
V23 "but we preach Christ crucified, to the Jews a stumbling block and to the Greeks foolishness,"
V24 "but to those who are called, both Jews and Greeks, Christ, the power of God and the wisdom of God."
V18 "For the message of the cross is foolishness to those who are perishing, but to those who are being saved it is the power of God".
The true message of salvation, that God does the righteous work to the humble heart that doesn't try to be good, is so vastly different and contradictory to what everyone else says, that people's initial response should always be "oh no that's silly, that can't be right". There aren't to many people presenting the gospel who know they are on track when they get that kind of response.
Other responses of misunderstanding one should get when telling the truth of the gospel are found in Rom 3:8 "And why not say, "Let us do evil that good may come?"- as we are slanderously reported and as some affirm that we say." Also Rom 6:1,15, 7:7.