"He seemed", "that is the impression I got"
Someone who prophecies in the name of the Lord when the Lord has not spoken to them receives a terrible judgment, but the same is true for someone who calls a brother a false prophet when in fact the Lord has spoken to them. I would not be so quick to judge, Paul said
1Corinthians 4:5 Wherefore judge nothing before the time, until the Lord come, who will both bring to light the hidden things of darkness, and make manifest the counsels of the hearts; and then shall each man have his praise from God.
This does not refer to judging things that the Bible has already judged. If the Bible has judged it we are simply agreeing with God's judgment. The same is true of false prophets. Are they creeping into silly women's houses through the TV and radio? Are they licentious, fleshly, denying the power of the Holy Spirit and denying the one who redeemed us? Are they trying to make merchandise of you?