Internet memes aren't really over the line trash talk in my mind, just dumb. I don't think Cruz thought Faber was in any way telling him his family needed to watch out.
It was embarrassing though. It could have only been worse if he had said, "I can haz belt!?"
Some people think that they can convey either a philosophy on life or a complex political statement using a signature on the internet. I'm not one of them.