Walgreens review: customer service

I went to Walgreens around 3:15 a.m. located at 1329 University Boulevard East Takoma Park, MD to see what was on said. I am going up and down the aisle handling products and checking prices. I really did not see anything I wanted. I eventually bought a small bottle of orange juice for $1.79. I got my receipt from the young male cashier. I left the store and threw my receipt in the trash. Lo and behold the security guard comes out of the store and looks in the trash can. I told him that just because I live in Prince George's Md that does not meant that I steal. I asked him his name. I also told him that he needed to go back into the store. He took a shopping cart into the store with him. I went to my car and wrote down notes about what happened. I went into to store and asked a young lady who was stocking items if she was the manager. She answered in the affirmative. I asked her what was her name. She told me. I asked her who was above her she told me she could not answer that. I told her what happened to me was the second time. I also told her I was going to corporate. By the way, I am black. The casher was black. The security guard was African. The manager of the store appeared to be of Ethiopian descent.