Jesus was polite to heretics. He preached to heretics. He wasn't polite to hypocrites. Those who pretended to be the gatekeepers of religion. Those who pretended they were Godly but were full of iniquity.
Mat 23:25 “Woe to you, scribes and Pharisees, hypocrites! For you cleanse the outside of the cup and dish, but inside they are full of extortion and self-indulgence.
Mat 23:26 “Blind Pharisee, first cleanse the inside of the cup and dish, that the outside of them may be clean also.
Mat 23:27 “Woe to you, scribes and Pharisees, hypocrites! For you are like whitewashed tombs which indeed appear beautiful outwardly, but inside are full of dead men’s bones and all uncleanness.
Mat 23:28 “Even so you also outwardly appear righteous to men, but inside you are full of hypocrisy and lawlessness.