Just don’t forget when you work, be professional. It means you have to be careful with what you think and when you speak, because it represents not you but the institute where you work. Reply a conversation with a conversation and so does a letter with a letter, with a proper and polite way of saying. Remember we are civil servant, so it’s our major duty to do an excellent service anytime people ask to.
You don’t have to build a bad opinion to show you’re right or you’re better. Grow up, please. This is an office, not a high school anymore.