Caucasian female bartender is awful!  Not only is she very rude and curt with customers, she refused to honor my free dessert coupon via my mobile phone.  She told me I had to go home and print it out, even though the coupon says that I could use my device to redeem it.  I told the manager, who was eating lunch at the bar.  She wouldn't even stop eating to see what my concern was.  Finally, she waved me over to over to her seat. WHAT? I guess my concern wasn't important enough for her to get her butt off the barstool and come to me.  Geeez!!!!