“Get off the phone, you big dope” is a Mark-ism...mostly meant to highlight his humor rather than insult you.
Your taking offense proves that you don’t listen to his show, however.
Well, I already said I don’t listen to his show because he shows his kindness and humility by being rude to callers, both liberal and conservative. Obviously, I’ve listened enough to know that, and to know some of his catch phrases.
But I don’t know the man personally and I know he loves his dogs and I know Rush Limbaugh likes him a lot so maybe he’s a very nice guy when he’s not on the air.