Mistress Jacky used her this loser's dirty soles to humiliate him. The mistress did not like the loser much and it was reflected in what she did to him. She chose to make him lick his own shoes after she had spat on them as opposed to licking hers. His were dirty and the perfect ones for him to be forced to lick as punishment. He regretted why he had dirty shoes on as that was one of the considerations for making him lick them.