My Girlfriend's best friend is a trust fund brat, what can I do?

My girlfriends best friend is a trust funder. The best friend is super shallow, super selfish and dreams of "being broke". I love my girlfriend to death but her best friend has like a multi million trust fund and is constantly comparing herself to us..Cept we actually work for everything we have and she will never know what its like to be homeless, stress over making rent, penny pinching, raised on welfare, managing your paycheck, you know how to actually survive without daddy's money. So we are planning a trip to visit my family and to tell them we are getting married....her friend chimes in and is "like oh you should come to visit me, I am not going to any of my cles and my daddy just got me this new apartment". I think its a horrible idea because my gf knows I don't mesh well with the superficial/selfish types and I want to let her know that her friend is a complete F*tard. How can I explain that her friend is mocking us when she has a mill in the bank and dreams of being broke?