You know I don't give a fuck, how ppl look on me.
I felt the same way as you do, and in fact still do to a point. When you have a wife and kid with you though, and someone looks down on you like trash, you can not help but feel something. Think what you want of me, because in truth I probably deserve it, but never look down on my wife or kids.
That clerk had no clue what my situation was. She could care less that I was going to college, working, and providing for my family all at once. She is probably still a cashier at the same place, and I now make at least 3 times more then she does. Yet, to this day she probably still thinks I am scum.
The employee at Michael's dodging you. That's happened so many times. Or you finally track them down, and ask if they have something and all I got was, "Um, probably not." I think the customers have more of a clue sometimes.