I looked at the dog's back What do you mean by sneering contemptuously twice?

A contemptuous smile means that the relationship between two people is very tense and there is little overlap in doing things. One day, two people met for some reason and talked about the way to deal with things, although one person's way is very suitable. But the other person won't care, and even the smile on his face is an expression of contempt for him, which will make the other person angry.