Cato review: service

I went into this Cato store, and I was treated very rudely, I felt like the African Americans decades ago, when they weren't aloud in stores to shop, I'm an older brown Hispanic American from TEXAS, and I never thought I would be treated like this, I personally felt the employees do not want me to shop in their store, they ignored me, I asked for a shoe size, and the employee would not get it for me she ignored me, I had things on hold, and I waited at the register and no one said anything, finally after they checked all the white customers out, I was able to purchase my items, when I gave her a brand new 100 dollar bill she clenched pug got a long time looking up at it, which is fine I understand, we have to make sure it real, but then she turned around and infrint of all the customers she hands it to the other employee and says does this look real, and stared at it for a long time up in the light, finally they determined it was good and they checked me out, it was alittle embarrassing, how they treated, but what can I do, my mother lives in the area looks white and shops there so many time s, and she was there that day and gave a 100.00 dollar bill and was not treated like that at all. If I'm treated like this Again, my mother and I will hire an attorney to protect are rights as American citizens