Are all rich people especially girls acts haughty and snobbish?

Anonymous
You see guys, my little brother's girlfriend (Fiancee) is a rich girl. she's polite when talking to our parents and normally sweet whenever she's with my little brother. too sweet to the point that I find them a bit corny, but the thing is whenever my brother isn't there and when I see her interacting with others or me. she usually act haughtily and snobbish. she would usually roll her eyes when someone hit on her or when I tried to make a joke she would just scoff and roll her eyes, but she wasn't antagonizing me (though it didn't help the fact that she would sometimes ignores me when I ask a question or when I'm talking). she just usually point out that I don't have a good sense of humor and lack proper etiquette because of the way I dress. it's not that I find her irritating. it's just I feel uncomfortable whenever she goes to our home riding different car models. there were even one time she was riding a limo and it irritates me because it become the subject of gossip around here (How I wished that she would just drag my brother and let him live in her house). I admit, she deserves to act that way with how rich she is. but still, I kind of feel like she's flaunting it. but her polite and innocent expressions made it hard to believe that she's doing it on purpose but she acts as if she's humbled. are all rich girl/guys (peoples) are all like this? because I do hope that it isn't. I sure hope not.
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and I post this question because I wanted to know how to break her out of it, she's a kind girl but she has trouble interacting with others because she was raised in a different way. if I offended you, forgive me then as I didn't mean to say that all rich people are like this.
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And I didn't mean to insult the rich people, I just wanted to know if it felt the same when interacting with rich people. it's as if they are so high up there and it's hard to reach them, that there is a line between them and the others which gave them hard time understanding each other.
Are all rich people especially girls acts haughty and snobbish?
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