Passed AC but not offered place because of "gender balance"

So I did an AC in NY for a bank for an S&T summer internship which I thought went very well, nailed all the interviews. Received a bizarre phone call saying that I had passed the AC with very good feedback but that they were not sure if they could offer me a place due to gender balance. By this stage, I was so shocked/ pissed off after previously being rejected from 3 ACs this year that I did not think of anything to say. Unbelievably pissed and don't know what to do...