Here is another tip from Dr. Travis Bradberry, co-author of Emotional Intelligence 2.0, about establishing boundaries.
"This is the area where most people tend to sell themselves short. They feel like because they work with someone they have no way to control the chaos. This couldn’t be further from the truth. Once you’ve found your way to Rise Above a person, you’ll begin to find their behavior more predictable and easier to understand. This will equip you to think rationally about when and where you have to put up with them and when you don’t. For example, even if you work with someone closely on a project team, that doesn’t mean that you need to have the same level of one-on-one interaction with them that you have with other team members."
"You can establish a boundary, but you’ll have to do so consciously and proactively. If you let things happen naturally, you are bound to find yourself constantly embroiled in difficult conversations. If you set boundaries and decide when and where you’ll engage a difficult person, you can control much of the chaos. The only trick is to stick to your guns and keep boundaries in place when the person tries to encroach upon them, which they will."
Learn more about Travis Bradberry and "Rising Above" Toxic People