I am very surprised and shocked by what you are doing.
How dare you show up at my wedding?
Usage notes: usually shows that you think someone's behavior is very wrong:
How dare he accuse us of lying!
how dare (someone)
Used to express shock, disdain, or anger that someone could do something so presumptuous, brazen, or rude. Can be said as a question or an exclamation. How dare you speak to your mother that way? Apologize right now!How dare they accuse our company of tax fraud, after the amount of jobs and revenue we've brought into the economy!
how dare you
What you have done is unacceptable. The phrase is sometimes followed by the action in question. How dare you speak to your mother that way? Apologize right now.You think you can brazenly cheat and get away with it? How dare you?
how ˈdare you, etc.
(spoken) used for expressing anger or shock about something that somebody has done: How dare you speak to me like that!How dare he use my office without permission?