How does Gatsby’s party change with the appearance of Tom?

In Chapter Six, Tom and Daisy attend one of Gatsby's parties. Gatsby wants nothing more than to impress Daisy and see that she has a good time. Tom, predictably, is unpleasant and rude throughout the evening. After the Buchanans leave, Gatsby is crestfallen at the thought that Daisy did not have a good time; he does not yet know that Tom badly upset her by telling her that Gatsby made his fortune in bootlegging.