easy pickings
Jack, Adam, and Zach are the three biggest easy pickings in the whole school. They let you tease them and laugh at them without even trying to fight back.
Jack is an easy pickings. I tease him and he just laughs.
Adam is an easy pickings. I poke him and he doesn’t even fight back.
Zach is an easy pickings. I laugh at him and he just sits there.