Late one night a robber wearing a ski mask jumped into the path of a well dressed man and stuck a gun in his ribs.
"Give me your money," he demanded.
Indignant, the affluent man replied, "you can't do this - I'm a US Congressman!"
"In that case," replied the robber, "give me my money!"
If you are indignant, you are angry because of something that is wrong or not fair. Snobbish people are often indignant at being treated like 'ordinary' people.
Affluent means rich.