Not really anything that comes to mind, as far as I can tell.
It has to do with perception.
You perceive Glowie to be annoying, and if you acted like Glowie, you would find yourself annoying. You could act like Glowie, but you don't, because you find her behavior annoying.
You possess the ability, and that is the point: you dislike things that you could just as easily do yourself even subconsciously. You don't see the good in Glowie because you see what is bad about yourself in her. Because we all could act just like Glowie. We possess the same inherent traits.
Now my argument against this is obviously that we all have the capacity to kill, and using this argument would justify it by saying you are just seeing the things you hate about yourself in murderers (moral relativism).
Actions and choices are how we should judge a person.