Is this really legal?

I am suing a person who works at Petco for robbing me. I have a lot of animals, and have to buy food about once a week. Were I live Petco is the only place that sells one of the foods I feed my dogs. I have never said anything to her when I go in there or tried started anything. Yet I go in there today ask for my 10lg crickets and go to get my dog food. Then the manger I am friends with come up to me and says “just so you know you are not supposed to come in here with what’s going on with you and blank”. Is this really legal I am the victim and i have to drive 2 hours to get dog food and crickets. When there is a Petco on my way home from work 5min from my house?