What is Grant's problem with going in the backdoor at Herni Pichot's house?

Grant's problem with going in the backdoor at Henri Pichot's house stems from his feelings of disrespect and humiliation. He believes that entering through the backdoor symbolizes his lower status and reinforces the racial and social hierarchies that he seeks to challenge. This act serves as a reminder of the systemic inequalities he faces, making it difficult for him to maintain his dignity in such a situation.