Age Discrimination

As a teenager, I can't say I have received adequate respect from malls, restaurants, fastfoods or any kind of business outlets. I am actually not alone in this social discrimination. Almost every teen I know are treated rather indifferently by people in the reatail world. It is stereotypical that the puberty or adolescent age span, especially in the middle class is considered not to be a business target. They always think that we are too young to buy anything, and we re left disrespected and even snubbed. I admit that this is slightly true, we cant reall afford to buy as much as my parents, but is that reason enough to be left neglected? Its only very rare for me to be greeted when I enter stores or restaurants, and it always make me feel bad. Even if their customers cant afford, they should not discriminate them openly, and obviously.
I always go back to stores that feels like I am welcome and skip the ones that feel so indifferently. But so far, some restaurants and stores are strategizing to treat customers better, no matter what age (Like Pizza hut Bistro, ). But still, many business are left to the discriminative perspective, which only leads more people away. If kids feel welcome, they can publicize that store to friends and mature friends, right? I dont really blame them 100%, cause the business world is not a walk in the park, and its just hassle to attend customers who are really not gonna buy anything. I can understand the stress that entails it. How can you become so welcoming amidst stress?
Of course, it is mildly our fault. Teenagers, who are pathologically and impulsively impressing their friends, might degrade our reputation as respectable customers, especially those who flee before they can ever receive the bill. As teenagers, we might not be actually proficient in the inhibited etiquette, and we mas as well be very inhibited.
I dont see this issue to be solved peacefully yet, but it is our duty, as the new generation to uphold our reputation.