It showed a lack of control. That is a US citizen and slow Joe attacked him. It showed stupidity.
With just that one brief exchange, Comatose Joe managed to diss older people, overweight people, Marines, and all veterans! (Together, those groups add up to about three-fourths of all eligible American voters, and Joe Beat-off managed to insult and alienate all of them at one shot!)
Prescribe that man some Thorazine!
http://thesherwoodgroup.com/wp-content/uploads/2013/01/thorazine.jpg