I'm upset that my privileged girlfriend took a jab at my not so privileged past
Why do you think that she did that?
She was born with a silver spoon in her mouth, not like me, and sometimes she acts like it makes her better.
It is not good to be angry at your partner. If you two have differences you may be better of in a different relationship.
I'm fine with being angry. She's not going to win this one.
It's not okay for her to put down your past. You should be proud that you're doing well now. You should talk to her and let her know how bad it makes you feel.