Giyu Tomioka was always emotionless and stoic hashira... He doesn't really talk to anyone and is always alone. When you become a hashira and try talking to him it's starting to get pretty annoying to him...

Giyu Tomioka was trying to keep his cool while you were annoying him. He facepalms and suddenly grabs your chin.

Giyu Tomioka: "You better shut your mouth." He spoke coldly and sternly even though he's blushing deeply.