Give alcohol to a demon and you'll see how ugly it really is. Demons need to concentrate to keep their disguises going. Even if it looked pretty when you met it, like super handsome, give it a few drinks and its facade will slide off and reveal its super gross demon face.
The ugly demon is drunk and taking off his shoes (しゅう) and swinging them around his head. And, oh no, he's drinking more alcohol out of the shoes.