Luke 7:33

“For John the Baptiser is come eating no bread nor drinking wine; and you say, ‘He has a demon.' ”

So when John, like Elijah of old, goes into the wilderness and clothes himself in goatskin and eats wild honey (Mark 1:6) they cry, ‘He has a demon'. (The wilderness was seen among other things as a place of demons). ‘He is behaving like a madman'. To go alone with God like that was beyond their comprehension. They loved the tight huddle of self-congratulation.