That's kind of an ignorant statement. If someone is an excellent candidate and has published a ton of derm research, possibly was already an attending in their home country, and/or has excellent step scores, I don't see why they shouldn't be given a fair chance. All things equal (or even with the FMG being slightly more competitive) of course the US Student should get that spot. Too much entitlement in people these days. Nobody should be fired for hiring someone who is clearly better than everybody else.
Also, not even interested in derm but I recall being bored and just looking at some resident profiles from some derm residents. I recall, at 2 separate top programs, a female resident who was the beauty queen in her home country or something of that nature, and another who was an Olympic athlete in her home country. Both of whom it looked like matched into programs directly out of their respective foreign medical schools.
But in saying that... maybe you're right, nvm. OP basically you have to do something extremely impressive/interesting on top of being a great candidate numbers-wise. So I guess unless you're really really ridiculously good looking, plan on competing in Brazil next year, or are secretly the president of some country, it's unlikely that anything you do for the remainder of medical school will allow you to match into something so competitive, even for US med students.