Frankie Says Relax

There should be a class on having a personality.
Now, I understand that we folk in the food industry are merely there as peons for you to boss around and snap at when you're having a bad day.
And really, most fast food places don't have much of an emphasis on customer service, just speed of service. But Starbucks is generally good about having English-speaking employees, and being generally nice.
So really, it would be so greatly appreciated if our smiles and 'how are you's were returned. It's not so hard. Even if you aren't fine, or great, or okay, just humor us for a few seconds.
Giving us a blank stare and waiting for us to tell you your total, and then shoving your money at is really isn't something we enjoy dealing with customer after customer.
Especially teenagers. Yeah, I know. I am one. (Only for 2 months and 2 weeks, but anyway.) But it seems like anyone between the age of 12-22 just has no common courtesy. Do parents not teach their kids to be polite anymore?
When someone asks you something, you answer them. When someone asks you how you are, or how your day's been, you ANSWER THEM. I am not a robot. I am not just a voice that comes through the little box at the drive thru. I do enjoy people answering my questions.
Also, when you go to places like McDonald's, Burger King, Sonic, what have you, do you just say 'yeah I want some fries'? Or do you say 'yeah, I want a small fry'?
You say the size, right? It's just generally helpful if the people making your food and drinks know what size to make. Same goes for Starbucks. Tell us the size please. We're sick of asking.
Be nice to us please. It would be a great change.