Why are other people obsessed with other people's money?

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I was watching a fashion documentary the other day when somebody commented that the women in the docu were parasites to society. The answer added that instead of buying expensive clothes or things, these women should ‘share’ their money.. As a person whose interest was in the topic of the docu only, I was quite shocked to read this comment. Granted that many wealthy women can buy more expensive clothes and other things that are necessities (and in many cases, access to luxuries), I don’t see a wrong if you are buying what you like. If the money spent was from an inheritance or a legitimate business, what’s wrong in spending that money on one’s self? I could relate to this. I earn my own money. I buy what I like and what things works for me (as recommended by others). I don’t want spending too much because I do contribute to the house and I need to save for the future. If I am earning a larger salary, I get taxed higher and somewhat I am still obliged to ‘give’ or ‘share’. In this issue, is it really ‘obsessing’ or being nosy about other people’s money something we posses naturally (or naturally curious about this subject)? Where do you draw the line when people keep asking on how you spend your own money?