Can business owner file harrassment case against customer the post bad reviews on web site

My husbands ex girlfriend works at a grill that also houses another business, I went to this business to make a purchase and didn't say anything to her and she came from behind the grill to the opposite side of the store where I was shopping and started mouthing at me. I reported her behavior to the owners wife. I completed my purchase and as I was leaving the store she was sitting outside and continued to mouth at me. I said "Screw you T,: and got in my truck and left, The next day I went back to the store to make another purchase and was escorted out of the store and told I was not welcomed there. I posted a review regarding my treatment on their web page and wrote a letter to the owner requesting an explanation why I was banned. Now I hear they are filing a lawsuit for harrassment