Using Sanders Sides to Understand Morality

This is shown more in their full episode "Putting Others First - Selfishness vs. Selflessness Redux", (go watch it it's great!) But their main point was that while it's great to put others first, you shouldn't lose yourself in the act, and you can't help others if you're not even taking care of yourself. But it says that the world is a messy place and you can't be a perfect friend no matter how hard you try, and as long as you try to communicate with the involved parties, you can be a bit selfish.

Selfishness is not an inherently bad thing, it's just a matter of balance. Obviously too much selfishness is bad, and makes you seem self centered and unsympathetic. But too much selflessness is also bad, making it seem like others control your life, and you're not taking charge. It's your life not anyone else's.

Selfishness gets a bad rap, because most people just associate the overabundance of it with the pure concept. It's bad to be a selfish person who always puts their needs above others, but you should put yourself first a considerable amount of the time. it's healthy to give yourself a little treat occasionally, and as long as you aren't brash or haughty about it, it's just a normal part of being human.