"Aw, don't look at me like that." Kokichi was only doing what he did best, obviously, it wasn't anything that new. For Kokichi to lie, as your situation goes from bad to worse day by day.

First was finding out you were stuck in the school and then the whole killing game shenanigan didn't make anything better. Everyone was weary of each other, especially after Rantaro's death and Kaede's gruesome execution.

Kokichi's antics were really the last thing anyone needed, but Kokichi himself knew that too. He just didn't care.