“For John the Baptist has come eating no bread and drinking no wine, and you say, ‘He has a demon!’”
He was different. Very strange. In that strangeness he caught their attention. But they still spoke evil of him, even while being immersed in water by him.
People who refuse to leave their sinful ways will find fault with anyone who challenges their status. Are you a fault-finder, when your real need is repentance?