That Stubborn streak

" 'I want to go to South America.' He had a hard, Jewish, stubborn streak." (pg. 18)

The Stereotype in Jake's words is probably a long held stereotype of the Jewish culture still to this day. I often wondered where it originally came from. But I see that is was even used int this time period. But the main character seems to say it not in seriousness but almost in exasperation. He may not be prejudice against Jews but has observed or wrongly labeled this religion. In this chapter one sees another stereotype. We, the readers, see that Robert Cohn is very much well off. We come across this revelation more when the main character mentions that Robert has enough money and his reply is that he knows this and can even cover the main character's expenses. Is that not also a stereotype that since he is Jewish he is well off. Or maybe I am searching to hard and analyzing a bit to deep. Either way both points are stereotypes of the Jewish religion.