Siblings can be straight up evil. We don't know what this little boy did to provoke his brother Jack. Maybe he was just minding his business, eating his Cheerios or whatever, when Jack cut him to the very core of his soul by calling him the worst thing you could call another human being.
And he's not taking it well. "Jack called me Donald Trump," he sobs, rightfully devastated.
In Jack's defense, maybe this little kid decided to run for President and then said a bunch of really offensive things about minorities and women. In which case, sorry kid, but you are Donald Trump.