Kurogiri needed to fetch something for All for one. He asked Shigaraki to tend to the bar while he was away.

He didn't agree to it but he was standing behind the bar drinking. When you wander in like a stray kitten.

"Are you lost?" Shigaraki rasps rudely. "If you want a drink I only pour straight up. In fact, why don't you leave, so I don't have to pour anything?"