Am I Old Now?

I had a weird experience today: when I was paying for lunch, the cashier addressed me as "dude"--and it bugged me! The Highschool (or college?) kid said something to the effect of "That's gonna be $8.50--dude." For some strange reason my reaction was to be taken aback--thinking that's not how you address a customer. The weird thing is that I think it's neat to get carded and all, but somehow I didn't like being called dude by the checkout dude.

Am I going to start complaining how kids these have no manners? How in my days we addressed our elders "yes sir" and "no ma'am"?! Not to mention walking uphill to and from school every day?!? Ack!