[Jon listens to the story frowning. How hard has it been to convince people about the Night King and the Dead? Even faced with a wight that he and his men had captured at great cost, Cersei Lannister had tried to use it as grounds for a deal that would give her an advantage by breaking an alliance that could keep his people strong and that he has personal reasons for not wanting to break. It had taken that much to get anyone very far south of the Wall to listen at all.]

You can't believe every fantastical story you hear, but that doesn't sound like that kind of story to me. I've seen giants. They weren't so tall, and they didn't eat people... they were our allies. The threat to us is an army of the Dead and the White Walkers who raised them.

It's hard to fight something like that when nobody believes you.