MSNBC panelists focused on one particular moment during this week’s presidential debate that made Donald Trump an international “laughing stock.” Kamala Harris seemingly triggered the Republican nominee by observing that many of his rallygoers leave early out of “exhaustion or boredom,” which set the former president on a meandering rant that featured debunked claims that immigrants in Springfield, Ohio, were stealing and eating pet cats and dogs — which mystified media outlets at home and abroad. “Even allies now worry that his unsubstantiated claims about migrants eating people’s pets has we…