heap scorn on (one's) head
To speak about one with contempt, disdain, or disrespect. My mother always heaped scorn on my hapless father whenever he spoke up about anything. It's fine to offer criticisms of their ideas, but don't just heap scorn on them.
heap/pour ˈscorn on somebody/something
speak about somebody/something in a way that shows that you do not respect them or have a good opinion of them: She poured scorn on his plans to get rich quickly.