Yes, in the United States, it is generally considered rude to ask someone about their salary or net worth, especially if you don't have a close personal or professional relationship with them. Personal finances are considered private and sensitive information, and asking about these topics can be intrusive and uncomfortable for the other person.
Discussing money matters can lead to feelings of judgment, envy, or embarrassment, as people's financial situations can vary widely. Additionally, income and net worth can be a sensitive topic, particularly in a society where wealth disparities exist. In professional settings, discussing salaries with colleagues can also create tension or awkwardness, as it might reveal disparities in pay or create unnecessary competition.
If you genuinely need to discuss financial matters with someone, it's more appropriate to approach the conversation with tact and sensitivity. If it's related to a business transaction or partnership, consider discussing general financial terms without directly asking for specific figures. Always be respectful of people's privacy and boundaries when it comes to discussing money matters.