It’s strategically smart to be flexible with your co-workers from time to time, but don’t let things go too far. You don’t want to set a precedent that you are some sort of pushover. Speak up if you start feeling like a doormat, and don’t be shy about protecting your territory or clarifying a misunderstanding. Sometimes the only way to get respect is to demand it. A quiet word to the right person will get you all the satisfaction you need, and it will show others that you don’t mess around.