Holgerson came over to greet Bella like a normal cultured person. Moreover, he likes Bella’s mother and tries to be polite. We were shown that his son is behaving like an asshole, but they did not show his bad deeds. Bella doesn't love him because he's courting her mother. Perhaps in the future he will turn out to be a villain, but we cannot know about it.Maybe because he is not only unceremoniously got into Bella's conversation with Nicka, but also took his hand in a rather intimate manner. And judging by Bella's reaction, this is not the first time and she does not like it.