I'm going to tell my significant other that she doesn't understand what being poor is, can you believe I have to even do this?
Surely you are kidding me on this, right? Why don't you think she understands what being poor is?
Because my significant other lives with her parents and doesn't work, I don't understand that.
It sounds like your girlfriend still has a lot to learn! It's good to be open with your girlfriend and let her know how you feel. Otherwise, it won't be good for you to keep your feelings inside.
I'm pissed she doesn't understand what being poor is.
Your feelings matter and if you think you have a good reason to say it then do. Poor people have a right to be understood. She might know about it if she was on her own and working, life is hard this way nowadays.