This is not the answer to the question he's been asking. He refuses to believe it, but then there's music and things are being shoved at him, and he is just so overwhelmed. He doesn't want this. He can't want this. The way that he has been treated, for centuries, by the guardians, and now he's expected to join them? No. He tries to back away, just a little, just enough to give him some space because he feels like he's going to explode and despite wanting nothing to do with these people, he doesn't want to hurt them. They do so much, and make so many kids happy and that is what matters to him most of all, so he tries to back away, but a yeti forces him back forwards, and everything is just too much. The yetis leave because apparently, they rehearse this, and they have a part to play which leaves him with room to back away, but it's not enough. He's getting upset, no he's been upset, now he's starting to get a little angry.
He's been alone for three hundred years, and now he's surrounded by people, and creatures who can see him and they're interacting with him and it's for a positive reason, but he's just so overwhelmed and he wants some space and he keeps getting crowded. No one else seems to have any problem with the amount of people in this room, but he can't bear it, and they just keep going, so when he finally has a chance, he slams his staff on the ground and ice spreads out, and it all stops. He tells them he doesn't want this, and he doesn't know what he expected, but it wasn't to be laughed at. He may look like a kid, but he's been through enough, and he deserves to be treated like an adult. He had been through so much, and these people, they didn't know any of it because they ignored him, pushed him off to the side like he was useless, and unnecessary and he was not going to stand here and be laughed at, or ignored, so when the jolly man himself acted like he was insane for even thinking about not wanting to be a guardian, let alone saying it out loud, he may have started to panic.
It didn't seem like he was going to be getting out of this, after all they had kidnapped him. He was panicking, and he didn't know how much longer he could take being in this place, being surrounded by so many people. He had been invisible for damn near three hundred years, and now suddenly, he was surrounded by four of the most important people, and he couldn't breathe. It was all way too much, way too much. They try to start the ceremony again, starting the music back up and it was already so damn hard just being near them, let alone being near them with loud music being played and now, now he was getting angry, because he may look like a child, but he is anything but. They listen and the music stops, and now is his chance. Clearly telling them he didn't want to be a guardian didn't work out, so now, he would have to convince them that they didn't want him to be a guardian. Really his plan was foolproof, tell them how unreliable he is, and sell the idea that he's a no-good kid who just likes to cause chaos and poof, they'll boot him out the door!
He is not surprised in the least when the rabbit agrees with him, after all, the rabbits' seen his mischief up close and personal. As a matter of fact, the rabbit is one of two guardians that he's met, and the rabbit is one he had hoped to never meet again. They didn't start off on the best terms and he certainly wasn't going to apologize after everything the spirit of spring had said, oh no. However, he is surprised when Tooth starts trying to convince him to join, that part he didn't expect, at least not from her, from the big guy, maybe but not her. She was already off on the wrong foot if she wanted him to like her though, three hundred years alone and now they want to get close and personal, no thanks, he had personal space issues, and he couldn't help the less than thrilled look that crossed his face when she got that close, although she didn't stay for long, flitting over to the globe to point out the lights that she said represented kids, no, believers. He thought he was safe with her over by the globe, but then North started to talk over her, and before he knew it, she was on him again, putting her fingers in his mouth and he was about to send this whole place into a snowstorm to rival that of Easter 68'.
She's gone as quick as she came, and then North goes into a spiel about the Boogeyman of all things, and he can't believe he's hearing this. North is gesturing wildly at the globe now talking about how when the Boogeyman threatens them, he threatens the kids, and this is precious. He guesses that he's the only child the guardians never cared about. He's sick of this, of being here, and he tells them to pick someone else, and starts to walk away when North says something that shocks him again. He's sick of these guys surprising him. He was walking away, especially once he heard that they didn't pick him, and honestly at this point he suspected they just threw a dart, when North says that he was chosen, which he's about to retort that picked and chosen mean the same thing when North says that it was Man in Moon, and well shit.