His main complaint is against rich people who "squandered in luxury and carelessness", the various ways in which "riches [are] a burden", how men care too much about the "limit of their lands". Almost every sentence seems spoken to someone too rich for his own good, with too many slaves, mistresses, clients, and land.
It fits in with my picture of Rome as having a strong class hierarchy (and up to 30% slaves!). This are the words from the "optimo iure" to themselves.