It may sometimes be awkward to set healthy boundaries with negative or draining people, but it is an important skill to learn. If someone has unrealistic expectations of you or unable to respect your feelings remember “No” is a complete sentence.
For the last several months we have been inundated by grouchy complaining people. So much that I actually did a radio commercial for our store on it. I try to see everything in my life as a blessings and a teacher no matter what the shape or color of the learning.