The author acted out of genuine concern for the women's safety, perceiving their discomfort as a potential issue. It's commendable to look out for others, especially in situations that seem potentially unsafe. The woman's dismissive reaction disregards the author's good intentions and the courage it took to intervene discreetly. She should be grateful someone cared enough to check on her and her friends instead of acting high and mighty.
While the intention might have been noble, the author's approach was undeniably intrusive and based on assumptions. The women were with coworkers, and the author's intervention, however well-meaning, could have caused unnecessary embarrassment or awkwardness. Labeling the situation as potentially unsafe based on mere observation is a stretch. The author needs to reflect on whether she overstepped boundaries and created a problem where one didn't exist, instead of getting offended by the woman's reaction.
The author's actions stemmed from a place of concern, but the execution was flawed. While it's admirable to want to help, assuming distress and intervening without clear evidence can be problematic. The woman's reaction, while perhaps not appreciative, is understandable given the situation. The author needs to realize that she should be more cautious when dealing with similar situations. Also, the boyfriend is overreacting, so he needs to chill out.