I'm a tenured professor but if I heard that conversation and did not report it, I could be fired immediately. Of course it would take someone else reporting it and knowing that I heard it and did nothing, but it's a big deal. We had to go through sexual harassment training and they were very specific about such situations.
Don't know how it applies to coaches and to students overhearing, but they are treading on thin ice to be talking that way. I suspect they could be fired for just saying it whether or not they directly harassed the girls.