I also stick to TPF. Even my roommates don't know quite how expensive LVs or Balenciagas are. Once a friend of mine said something like, "You know you could have sent that money to a charity or to people in need in other countries." She did guilt-trip me and I felt pretty bad about that. Now I hardly tell anyone when I'm getting a new bag.
Don't let those girls get to you. LVs are beautiful, sought-after bags that are always in style! Get what will make you most happy!
I think it's better when people don't say anything. It's really up to you how you decide to spend your money.