himself. he's always saying. >> hello. hello. >> reporter: to a hackler or waving good-bye. >> bye, bye. >> reporter: at one point trump was accused of being too rough on a hackler that got him shoved around. >> get him the hell out of here. >> reporter: and other times trump softened his approach. >> get him out but don't hurt him. >> reporter: he handles hacklers with shrugs, smiles and once got flak for calling a hackler over weight. >> i mentioned food stamps and that guy that was over weight went crazy. >> reporter: you could get dr. jekyll or mr. hide. from jeb bush asking a hackler to speak up. >> excuse me? >> reporter: to chris christie saying sit down. >> sit down and shut up. >> reporter: bernie sanders decided to stand down when black lives matter protesters showed up at his podium refusing to