Here's a bit of free advice :) when you start to use this argument, consider that perhaps you've run out of good rhetoric.
You seem a decent enough guy, if a little clueless, so I'll give you more advice if I may. Making lewd comments certainly might make others feel uncomfortable (male or female), but the fear factor comes from attitude and presence, not the words.
For example; had these two guys been leering at Adria. And staring at her, deliberately raising their voices to project their jokes to her hearing.. that is the sort of behaviour that starts to become frightening.
No one has suggested this is the case. They made a joke between themselves, that made Adria uncomfortable. That is a far cry from her fearing for her physical safety.