He opened his mouth and spouted stupidity.
If he can't handle the return fire, he shouldn't have opened his mouth.
If he hasn't learned that lesson yet, then it's time.
From my understanding of the article, he made an off the cuff comment during a friendly chat with a reporter.
He's not a polished adult politician that has an extreme awareness of literally every word that leaves his mouth.
He's just a kid.
What the hell is the matter with you.