I love Ryback honestly but ive listened to a lot of interviews from him and he comes off like a asshole a lot. Hes struggling to get to the top after being the company for a long time so his bitterness is to be expected.
He isn't in character right there. He's being himself. If you pay attention to his legit media interviews, this is an ongoing theme. He hates the criticism he takes from fans. He hates the Goldberg chants, he hates the "you can't wrestle" chants, and you can tell that it gets to him.
When he began criticizing "the internet" in that interview the guy had only asked him who he wanted to face at Wrestlemania. The reason he started talking about the internet is that he wanted to preempt the criticism he would get for his answer. And everyone here knows that Ryback, at his current level of stardom, does not deserve a match or any sort of interaction with the Undertaker.