Vigour
Here we see Old Rusty Neck, the public shoelick, tongueshining a bright young woman’s boots with vigour, as he very much fears the threat of her cane hanging over his bent back. Note too how a delightful pair of black sneakers and black socks await his tongue’s attentions as they are seated next to the boots.
Meanwhile, the only truly vigorous man in the scene looks down with fully justifiable contempt upon the elderly, public shoelick as he tongue-attends to the dirty boots and sneakers of the man’s two lovely, young ladyfriends. You would never catch him licking a girl’s boots!