Earlier quoted context omitted.
why does it fall on the person being made uncomfortable to correct the behavior of the being making them uncomfortable?
Who else would? If something makes you uncomfortable and you don't try to correct that... It will keep going. Of course, sometimes that's not possible (threat of physical violence and whatnot), but in many cases it is perfectly fine. Especially if the other person is just naively making you uncomfortable instead of trying to harm you. And being corrected on the spot is much more effective than someone else telling yo…
yeah it's not a cardinal sin or explicitly hurting someone, but I would expect a well adjusted 21-23 year old male engineering senior to know this