What line of reasoning does Yevgeny first use with his son about taking his tobacco, and why does it not get through to Seryozha?

In the story "Home" by Anton Chekhov, we learn about a boy and a father. The father, Yevgeny, is going to scold his son, Seryozha, for smoking.

The first line of reasoning that Yevgeny uses is that of being very angry. With a calm tone, Yevgeny tells Seryozha that he is very embarrassed of him, that he does not love him, and that he is no longer his son.

However, this does not get through to Seryozha. The boy is skeptical. This is a testament to the love that exists between them, as the boy knows that his father cannot be serious. Moreover, the father is not able to be as harsh as he wanted to be, by promising to kiss him after, and by sitting the boy on his lap.