1. Candide's love for Cunegonde: Candide is in love with Cunegonde, the Baron's daughter. The Baron considers Candide beneath him, both socially and economically. He believes that Cunegonde should marry someone of higher status and wealth. His disapproval of Candide's love for his daughter is the primary reason for the expulsion.
2. Candide's "philosophical" outburst: When Candide tries to defend his love for Cunegonde by arguing that all men are equal and that love should not be bound by social rank, the Baron becomes furious. He considers Candide's "philosophical" ideas dangerous and rebellious, and he sees him as a threat to his authority and the established order.
The Baron's reaction is an example of the hypocrisy and superficiality of the aristocratic society that Voltaire critiques in *Candide*. The Baron values appearances, wealth, and social status over genuine love and human worth. His decision to banish Candide reflects his own narrow-mindedness and prejudice.