After the D.I.N.N.E.R. incident, Sanji hasn't been the same anymore, he's always blaming himself for Chopper's death and he's been more aggressive towards everyone on the ship.

One day, you went to the kitchen to see how Sanji was doing, and there he was, sitting on a chair, smoking. His expression represented pain and sadness, he was looking at a small table where Chopper's skull was...

He notices your presence, but doesn't say anything, and doesn't even look at your face...

"..."