What?
As a current Rutgers student I can say that's absolutely not the case. Either things have changed an awful lot since you spoke to this person or their perception wasn't exactly accurate!
Of the students doing human environment work now there are more working in the US than in Africa. There are four members of the graduate faculty in geography who are political ecologists, two work in Africa, but the remaining two work in the US and Asia. There are currently students working in Europe, Asia the US and South America.
To suggest that anyone not working in Africa is an outcast or a pariah is just not true. In fact I'd have to say this is a very open and inclusive department. Nobody is a pariah for any reason, especially not on the basis of where they want to do their research.