They leap to unnecessary and often absurd conclusions in order to see those they oppose in the worst light (Matthew 9:34, 12:24).
They watch in order to nitpick (Matthew 12:2).
They like conspiracy theories (Matthew 12:14, Mark 3:6).
They're always looking to take offense (Matthew 15:12, Luke 14:1).
They seek to "win" with malicious tests (Matthew 16:1, 19:3, 22:15).
They seek to "win" by parsing words (Matthew 22:15, Mark 12:13, Luke 6:7, 11:53).
They grumble (Luke 5:30, 15:2).