What is the English idiom, expression, or proverb to express that even if I am proved wrong by all the members in the room, still I flaunt a false pride as if nothing happened?
In Hindi, there is a saying, "Gire to gire phir bhi tang upar!" which literally means "Even if you fell, still you act [to naive people] as if you have won." The meaning is that a snob always acts as though he has won the debate, game, or election when everyone else around him knows within himself that he has lost it.
Jim and John are coworkers working for the same boss. John the snob has returned from the boss's office bringing along his termination letter for blatant incompetency, screwing up on a project, tardiness, and having a negative effect on other staff members' morale. While behind closed doors John grovelled to his boss, begging to give him another chance. Once outside he brags to Jim. Here is that conversation:
Jim: How was your trip to the boss's office?
John: Oh! the boss. I back answered him and came out. I don't care.
So here the expression means "Even after John's setback, still he portrays himself (primarily to convince naive, unaware bystanders) as unbothered or unfazed by the whole episode and implies that, on the contrary, he went into boss's cabin and gave him a piece of his mind and then came out.