1. I always am. (arrogant or humorous, depending on the situation) 2. Yeah. (arrogant or neutral, depending on the situation) 3. Thank you. (appropriate) 4. Thanks/ Don't mention it./Not at all./Glad to help.

Yeah, that guy strikes me as very odd.

1 or 2 can be humorous, man. don't take these as insults.

Would you really consider using 1 or 2? Perhaps I do not understand Persian humour. These would not be well received in a British English context, in my opinion, and would not be at all advisable in a face to face meeting. 3 is OK, but is not generous-spirited. If someone has the good grace to acknowledge that you have the facts or the logic in support of your view on a particular occasion, might it not be good sense and normal human decency to acknowledge their concession with charm and good grace on your own part? And this is not just common decency or a cultural norm; there is a potential benefit to you as well. If you take an aggressive, superior or dismissive line (as in 1 and 2) you risk turning a discussion into an argument into a feud into a long-term enemy. Is the little bit of childish ego-gratification of saying “yah boo” really worth that ...? https://en.wiktionary.org/wiki/yah_boo