if talking to someone is like talking to a brick wall, the person you are speaking to does not listen.
I've tried to discuss my feelings with her, but it's like talking to a brick wall.
be like talking to a brick wall
To be like being ignored. Talking to you when the TV is on is like talking to a brick wall. Hello, can you hear me?Trying to share my opinions with my grandfather is like talking to a brick wall because he views modern society with such disdain.
talk to a brick ˈwall
(informal) used when somebody refuses to listen to your advice, ideas, explanations, etc: Talking to him is like talking to a brick wall. He just won’t listen.