Starbucks

I go almost everyday to starbucks. Last week I thought I take advantage of the happyhour that advertised that you when you buy one coffee drink get a second of equal or less price free.
I was standing in line and the barista - a female - explained this to the customer in front of me. She customer received two hot chocolates for the price of one. I asked her if I can get one latte and one hot chocolate. I am a starbucks member since more than 10 years. She told me that I am not eligble for this offer as I have no starbucks account. I told her that this is quiet interesting as to my knowledge I do. Then she asked if I still take both - the latte and the chocolate and I owe her about $8+. I said no I will not I just take the latte (it tasted not really good). Later on I talked to the supervisor and mentioned that I will file a harrassement claim as she gives these offers to everyone, accept to caucasian female customers.
Please starbucks you need to educate your staff to treat people of each race and gender equal. Btw I like to get a certificate for the free chocolate.