Appropriate response to "Thank You"

I am tired of going into Tim Hortons, Walmart, Sobeys, etc and feeling like crap when I leave. I buy my stuff and give them my money, when the transaction is completed, I say Thank You. 9 times out of ten, the person at the counter either says nothing or says "Yup".

My money is what is helping you get you 54 inch waist, you can atleast be kind when you are taking my money.

However, there is a girl that usually works in the speedy checkout (1-10 items) in the Superstore on Young street who is always friendly. I would rather go there ten times with 10 times or less, rather than get some moron who cant speak in sentences. To this particular checkout woman, Thanks. Always a pleasure going through your isle.

To the rest of you, get a job out of the public eye

Yup