A Grand Show-Off from the Start, Then Unbeatable All the Way

Hostess: "Why should I thank you? I didn't ask you to save me." [Spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit] [spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit][spit]

What does it mean that the protagonist is so cowardly towards the girl from the Su family? Inexplicable