it means the persion don't pay much attention to what you said or he don't care.then he wouldn't do as what you said either.

耳旁風 從耳朵旁邊吹拂過去的風。 語本漢˙趙曄˙吳越春秋˙吳王壽夢傳：「富貴之於我，如秋風之過耳。」 後比喻對所聽到的事毫不關心。 唐˙杜荀鶴˙題贈兜率寺閑上人院詩：「百歲有涯頭上雪，萬般無染耳邊風。」 在臺灣習慣說成「耳邊風」。 這個「風」其實就是比喻「說話時吐出的氣」。 好話當作耳邊風 (諺語) 把他人勸諫的話不當作一回事，不聽從勸告。 如：「別把好話當作耳邊風，一旦吃虧上當，想要後悔就來不及了。」

耳旁风 is something others say but you pay little attention to it on purpose. For example, "他把我的话当作耳旁风", which means "he regarded what I said as nonsnse."

It means you turn a deaf ear to what other people said.

It means that not mind the words of others.不把别人的话放在心上。