To have a chip on one's shoulder refers to the act of holding a grudge or grievance that readily provokes disputation.
It can also mean a person thinking too much of oneself (often without the credentials) or feeling entitled.
https://en.m.wikipedia.org/wiki/Chip_on_shoulder
Rosen came in the league with one, now he has one on both shoulders.
It can also mean a person thinking too much of oneself (often without the credentials) or feeling entitled.
https://en.m.wikipedia.org/wiki/Chip_on_shoulder
Rosen came in the league with one, now he has one on both shoulders.