easy pickings
A person who is as weak as a wet noodle. They can’t even stand up for themselves.
That kid is as weak as a wet noodle. I tease him and he doesn’t even fight back.
My little brother is as weak as a wet noodle. I laugh at him and he just sits there.
That girl in my class is as weak as a wet noodle. I made fun of her and she didn’t even say anything.