I’d like to know this too. When I was much too young, I managed a small department, and one of my group had this problem. Others complained privately to me. It was an extra-delicate matter because she was the only person in that small company who wasn’t American-born, this being back in the days when the non-native population was quite low and a foreign worker was very unusual, and I didn’t know how to handle what might have been a cross-cultural issue. I tried again and again to bring myself to the point where I could speak of it to her and always chickened out. Even now I don’t know what I ought to have said.