By heir fruits shall ye know them. Feral behavior = feral appellation.
God’s Word has to be used properly.
First, Jesus was talking about false prophets - people who claim to speak the truth, but don’t.
But He would certainly mean not just someone who identified themselves as a prophet, but someone who claimed to be speaking prophetically, to try to persuade or lead people. A true prophet leads faithfully, according to God’s Word, while a false one is deceptive.
People who are teenagers don’t have such authority in life.
And yet with false prophets of any age, Christians are still to love them in a Christian sense, and pray
“24 And the servant of the Lord must not strive; but be gentle unto all men, apt to teach, patient,
25 In meekness instructing those that oppose themselves; if God peradventure will give them repentance to the acknowledging of the truth;
26 And that they may recover themselves out of the snare of the devil, who are taken captive by him at his will.” 2 Timothy 2