Englishbackbiting
noun
there is a lot of backbiting in the world of television:
malicious talk, spiteful talk, slander, libel, defamation, abuse, character assassination, scandalmongering, disparagement, denigration, vilification, vituperation, calumny, revilement;
insults, slurs, aspersions;
informal bitching, bitchiness, cattiness, mudslinging, bad-mouthing;
British, informal slagging off, slagging, rubbishing.
▷antonyms praise.