That was one of the most ignorant answers I've heard in awhile. At least do some research on the topic or read the Bible before making such a generalization on demonology. Read the account recorded in Acts 19:13-16,
"Some Jews who went around driving out evil spirits tried to invoke the name of the Lord Jesus over those who were demon-possessed. They would say, "In the name of Jesus, whom Paul preaches, I command you to come out." Seven sons of Sceva, a Jewish chief priest, were doing this. (One day) the evil spirit answered them, "Jesus I know, and I know about Paul, but who are you?" Then the man who had the evil spirit jumped on them and overpowered them all. He gave them such a beating that they ran out of the house naked and bleeding."
Clearly the MENTIONING of Jesus' name does not necessary utilize the POWER of his name. In fact, all power granted to you comes from God Himself. So if you effectively drive out a demon, it was the power of God working through you. Keep in mind, God is under no obligation to work his miracles through you in the first place. Don't think that YOU have the power to drive out demons because you can pronounce a name. In fact, I know of many demonic encounters where it took hours of praying before God drove the spirit out. At the center of this, God is testing our faithfulness, not our ability to utter a name (as the passage in Acts suggest).