Nordstrom Rack

I shop at Nordstrom rack quite often and have noticed every the time I go to Nordstrom rack (located in Wauwatosa) with my daughter (she is usually in her stroller), the security guy follows me around. Mind you I have spent hundreds of dollars in this store. Last night I went there again with my boyfriend and my daughter to pick up some shirts for fall pictures. When we were done we proceed to check out when the cashier had the audacity to ask me if I had the tag for the sweater I was wearing. I was confused and shocked. The manager told the cashier through the walkie talk to ask me that question. I am so upset and can't believe it happened. I will never go back to that store and will look legal advice on this matter.