"I argued with a scholar and won. I argued with an ignorant person and lost." Imām al-Shāf'i
An ignorant person does not care about the truth - he will not follow any logic or hold himself to any etiquette. It's like a person who plays soccer, picks up the ball, runs as fast as he can and dives head first into the goal. When you explain to him that he is wrong, there are rules to follow, he can't carry the ball with his hands, he yells at you, calls you names and says, "Goal!"