He was on one of those prank shows. The interviewer claimed that Obama wasn't an American and Hillary had smoked a cigar. He grew so angered he said the F word fifthteen times.
He overreacted and made a fool of himself.
Yes, these prank show people are mostly annoying, but for someone to get that annoyed is ridiculous.
It was all in good fun, but this kind of stupidity is what influences people to act the way they do.
Just look at YouTube, people post videos influencing their viewers to act as stupid as they do, and they succeed, because the viewers soon post their own idiotic videos.
People are encouraged to act like idiots, and that's why so many people are idiots.