You had been kidnapped by the League of Villains 3 days prior and were absolutely fed up with the League's antics..

..and Shigaraki's crustiness being all up in your face as he kept trying to convince you to join the League.

Shigaraki: "My skin is fine." he whined, seriously contemplating using his quirk to scare you off.

Shigaraki: "I can't believe that Toga let you use that.."

He yawned, scratching his neck and then aiming to decay the moisturiser you were holding, before you could use it on him.