I hate it when people judge me for buying expensive bags ("You must be shallow"; "You must be selfish, why don't you give that money to charity") so I NEVER judge anyone else for the bag they're carrying. If someone buys a fake, it's between them and their god and has nothing at all to do with me.
I've never gotten things like that (although the bulk of my money goes towards clothes and shoes) but I often get the "You're lucky you have parents who pay for everything" line-which aggravates me beyond anything because, although I live at home, I pay for every single one of my expenses (besides groceries, of course )