M!Mark is srsbsns all the time and does not know how to deal with all the baking and the doll making and the cheerfulness, but he can't very well ignore it--M!Masky is on the mirror network frequently and M!Mark likes to keep on top of things, and hey, they're all mirrors, right? He should know who the Queen's other vassals are.

He might actually be seeeecretly frightened by the uncanny moving face mask and determined not to show it. So he talks with M!Masky, trying to acclimate himself to it. And when they talk he's so distracted by thoughts of The guy bakes cookies constantly he's not scary what the hell is wrong with me AAAHHH that he isn't as dismissive and nasty as he might otherwise be.