I tend to side with Poster B.

Poster A shows a disregard for the rest of the group and other people's characters by requesting that the universe be bent around their character, and seeks to 'godmode with permission' another player's character by denying them the chance to interact, infringing on that character's autonomy by design and forcing them to behave in a manner that is out of character. I don't see why Poster B should compromise their character so as to suit the plans of Poster A.