The Torah state “do not accept a false report (Shemos 32:1). The Chofetz Chaim is apparently of the opinion that merely paying attention to loshon hora being spoken constitutes giving it some degree of credence, and in violation of this prohibition. Just as it is wrong to select the shortcomings of others as subject matter for one’s own speech, so too it is wrong for one to focus his attention on negativity being expressed by others.
– Sefer Chofetz Chaim, A Lesson A Day page 230 day 90