She has explained it in the past, but let's say that he is not a humble down to earth type of guy. Seems that he may be one of the few players that doesn't care much to mingle with the DA.
Again I am paraphrasing her from previous discussions about it, but I think you get the gist.
Btw, on a personal comment, I wouldn't mind swapping Petracca with Bontempelli.