Q: Talking about relatives here, since you can shake off 'friends' like these.
A: I find it so embarrassing as humans, how we can judge eachother on how much money we make, when Allah (swt) clearly tells us that those who are higher in status to others, are those of us who are the most pious. Anyway, it is Allah (swt) who gives us, or restrains provisions to us! If you are happy with what Allah (swt) has blessed you with, then don't let them get to you brother. I also think the more that you show them that their comments bother you, the more that they will think that they are right. Salamu alaykum.