Kamala Harris blasted Donald Trump rallies as “boring” in their first-ever presidential debate on Tuesday night, hitting on a sensitive subject for the former president who has placed much emphasis on crowd size. RadarOnline.com can reveal Harris, 59, jokingly encouraged viewers to check out an event hosted by Trump, 78, saying: “It’s a really interesting thing to watch.” As the back-and-forth between the rivals grew increasingly heated on the ABC News debate stage, Harris quipped: “You will see during the course of his rallies, he talks about fictional characters like Hannibal Lecter.” She wa…