The most common problem for Christian nowadays, when they share the Gospel, and then when someone suddenly offended them, they entertain or they insult back.
They already know the rule of preaching the word of God. Be ready about those who rebuke and exhort. The best thing to do is be patience and understanding.
How can people know that what you’re saying is true if you don’t reflect it by your actions?
Remember, argument is different from sharing. Argument is fueled by hate, and pride, while sharing is fueled by love, and care.
Be humble yourself. Don’t think that you are superior just because you know the Gospel.