Avi K – “Mdd, that does not apply in our time (Chazon Ish Yoreh Deah 2,16 and see also Rambam Hilchot Mamrim 3,3 and Rema Yoreh Deah 340,5). Even in Chazal’s time it only applied where one was a witness to an aveira. If that applied in our time we would all have to hate each other”
The Chofetz Chaim holds it even applies in our day & age!