We use this expression to criticise somebody because they don’t listen to what you tell them.
You can use this phrase in ………… language.
A: Have you written that e-mail that we talked about?
B: What e-mail? Sorry, I don’t remember anything like that.
A: Oh my god! It’s like talking to a brick wall …
A: I keep telling the children not to leave clothes on the floor, but they don’t listen.
B: Yes, I know. It’s like talking to a brick wall.