Why is Marullus upset with the crowd Julius carsar?

Marullus is upset with the crowd in Julius Caesar because they are celebrating Caesar's triumph over Pompey, despite having previously supported Pompey. He sees their fickleness and lack of loyalty as hypocritical, criticizing them for forgetting their previous allegiances. Marullus believes that the crowd's behavior reflects poorly on their character and undermines the values of Roman citizenship. This highlights the theme of loyalty and the consequences of political manipulation in the play.