Can u sue a bar in woodbridge NJ for banning a black muslim girl cause of her religion?

i went to this sports bar called big shots in woodbridge, NJ with my girlfriend who is african american muslim. we went there a bunch of times before. On thursday the bouncer said she cannot get in cause she was banned from shannon rose (diff sports bar in NJ).first of all she got banned from there more than 6 months ago.reason she got banned was she doesnt drink liquor and the bouncers pulled her out for approaching a white guy at the bar. she just went to ask him if the bar will get busy later since it was dead. the bouncers pulled her aside and told her the owners wants to speak with u. she went outside with me and the owner told her, that he saw her talking with a white guy. i was like so whats the problem? he said if she is going to buy a drink. she said no. he said she is banned from here (shannon rose). remember this is 6 months ago. not her fault. she didnt do anything. anyway she was crying and now thursday at big shots in woodbridge NJ, the bouncer pulls us aside and said she cant get in here anymore. we asked y and he said the owner of shannon rose talked with the owner of bigshots and they dont want her here. than he said a guy came from shannon rose and told big shots she disrespected him. we said that makes no sense and what does that have to do with big shots since the incident which never happened took place in shannon rose. im not going back there for sure. but in todays world, 2011, banning an african american muslim girl cause of her religion is not right. what can we do?