Earlier quoted context omitted.
What is described in the article isn't sexism - it's fear. Fear of being labeled as a sexist.
It’s probably both. The men are assuming based on the female founder’s gender _alone_ that she might accuse him of sexism. Regardless of how rational this fear is, they are stereotyping new female founders they’re meeting for the first time based on what an X% of other female founder’s have done in the past. For the men, it’s probably a risk/reward calculation. Keep your head down and be polite and have ~0% chance of…
With female its the potential unknown predictability that causes the fear.