This is very good advice. I think a lot of times we don't see what other people are going through, or what they may be going through. Someone you think you know so well and that smiles everyday and seems so happy may cry themselves to sleep each night.
10 Words Every Girl Should Learn - "Stop interrupting me," "I just said that," and "No explanation needed." Behaviors like interrupting and over-talking, happen as the result of difference in status, but gender rules.This suppressing of women's voices is what sexism sounds like.