I will be the first to say that I am privileged. My parents provide for me. There's always food in the fridge and a roof over my head. I know that, if I need new shoes, or something for school, my parents will be able to get it for me. But I will say that I am not spoiled. It is expected of me to stay out of trouble and keep straight A's in order to get the things that I wanted. When I get my license, I have to pay my parent's for my dad's old car so that I can have it. Then, I have to pay for car insurance and gas and to make any changes to it that I want.
I go to school with plenty of kids that are the same way. And plenty of kids that are not. There are kids that are failing and don't have a job that are driving around brand new cars. There are kids who get mad when they aren't handed everything they want. And we all live with them. I'm not saying that there's anything wrong with your parents paying for your things as you grow up or even paying for things like your phone bill or even helping with your college tuition. I'm talking about the kids that get all of their expenses paid for them, even after becoming an adult and moving out.
Sure, it's annoying that there's people out there who don't have to work for what they have. The reality is, though, that no one would really know what all your parents bought you unless you told them. I wouldn't know that your parents filled your tank or bought you tickets to a music festival unless you felt the need to tell everyone.
Teenagers and young adults don't get mad at kids for getting things they don't get. They get mad because those kids don't understand what it is that they have. They don't understand what it's like to not have to worry about where their next meal is going to come from or how they're going to put gas in their car to get to their two jobs after school. They don't understand that people can be annoyed without hating them. No one hates you because your parents bought you a car, people hate you because you crashed the car and don't care because they will just buy you a new one.
When these kids talk about their vacations to foreign countries, their tone is appreciative, sure. They talk about their "cultural experiences," so at least they get to experience other cultures and broaden their horizons. That is, until you realize that their idea of a "cultural experience" is a bunch of teenagers dancing around in the dessert disrespecting a number of cultures.
As my mom always reminded me, these are going to be kids with very difficult lives. These kids have grown up without knowing the value of a dollar. They won't know what to do if faced with some sort of financial problem. These are the people that won't know how to get a job or make money or function without the helping financial hand of their parents.