Set your own boundaries and be sure others are aware of them. Standards and boundaries are different. Think of it this way. A standard defines what you demand of yourself, what you will do or will not do, and what you require of others. A boundary defines what you will accept from others.
Boundaries are the autopilot of appropriate behavior.
Understand the two definitions of responsibility. You also have a BIG responsibility TO others. You will be judged by how effectively and quickly you respond to a host of people and challenges, some fair and reasonable, many unfair and unreasonable. Frankly, the difference is irrelevant. The only thing that IS relevant about a demanding person or situation is what you do about them or it.