Next time you witness a so-called friend being cruel, try saying something like, "Oh c'mon, leave her alone," or "I think her sweater is nice," or simply change the subject by talking about a new teacher or IV show or asking a question about anything at all. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.