Growing up, my dad had a pretty decent job with an electricals company, even having his own massive workspace. It doesn't mean we had loads of money, but we had enough for food and stuff. I later found out my parents were saving up for their own business, which they started when I was about 9. Business wasn't exactly booming, so we'd have very little money. There were a few times where I wouldn't have meals because we couldn't afford food (although I partly attribute that to the fact that my brother ate loads), but at least my parents were in a job they liked. We didn't really get too many nice things after that, the nicest one being one Christmas where my parents had saved up for ages to buy my brother a PS2 and it turns out I'd gotten one too. Mine was second hand while his was new, but I didn't care because I liked the PS2.
I wasn't too bothered about not having much money, because when I wanted something I'd either save up or I'd find the best place to buy the item from. All my clothes were from Tesco or charity shops, which I didn't care about because I didn't really care about fashion. What bothered me was the attitude towards being poor. In school, while most people were from similar backgrounds to me or worse, there were still some who were pretty well-off, and they'd walk around like the Queen. One girl would look down on me a lot, and she even told me it was because I'm poor. We had another girl who "couldn't understand how people can be poor" and bragged about how her daddy bought the house next door so everyone in the house could have more rooms for themselves. And one girl annoyed the hell out of me because in the middle of class, she moaned to her friend about how terrible her life was because her dad bought her and her sister the wrong style iPod - he got them the 32GB version and she wanted the 64GB so she shouted at him and told him what a terrible father he was. Truth or not (and poor or not), it's a crap way to treat someone.
Anyway, I'm going off the subject now. When I got to college, many people were pretty well-off, especially people from further away from the college. Many of them pretty much exuded the negative stereotype of a rich person, which is bad because there were many positive qualities too but these were the main ones people saw. One girl I know was extremely spoilt, and she would regularly bring up all the stuff she had (her own car, a villa, etc). I wasn't jealous really, mainly because a lot of the stuff she had was just for show. However, what bothered me was her attitude towards those without much money. She'd refuse to go to certain places because she considered them "poor places" and she even refused to hang out with a friend because "he was poor". It was hard not to see her as just this stereotypical stuck-up girl.
There's one friend that bothered me more than anyone else though, because he has a remarkable lack of understanding about poor and rich. He's never worked a day in his life and regularly gets money off his parents, and he "can't understand how other people can survive without less than £100,000 a year". He even has a spare house he never uses, given to him by mummy and daddy. I can't help but feel that when he finishes university, he's going to be screwed in some way or form.
tl;dr version: It's not the lack of money that bothered me, it's the way I'm treated for it that I get annoyed with.