Give not that which is holy unto the dogs, neither cast ye your pearls before swine, lest they trample them under their feet, and turn again and rend you. Matthew 7:6
God is intolerant of rejection. Read Romans 1:21-25 He is always receptive to repentance but if you choose to reject the word, God will quickly turn you over to yourself. Disastrous choices are the downside of free will! When you have given someone the good news and they reject it, especially with caustic loathing, then leave them alone. You have done your part and should no longer give that which is holy and precious to dogs or pigs. This is the sad but necessary balance to bold evangelism!