The correlation between the two lines in this particular lyric extends beyond the simply being disliked for his success and long-standing presence in the industry and includes the act of seasoning foods with varying herbs, spices and, most commonly, salt.
DCFS in some states is Department of Child & Family Services; the government has intervened in their family situation. Kanye is talking about the underprivileged status of many children who are "in the system" or diagnosed with learning disabilities.
...seen em repo-d, resold, and be driven. Saying like he's seen people at the top of their game getting Range Rovers as gifts, only to see them fall out and have the car repossessed and probably driven right in the same hood by the next hot hustler.
Cam is refering to recording artist Cam'ron and the shit he got to pop is in refernce to the line before this one "..they thought pink Polo's would hurt the ROC" Cam'Ron made wearing pink "Okay" in the Rap community and shortly after Kanye did.
Kanye West felt his lost out in an awards show (possibly reffering to a specific incident), therefore he got 'robbed' of that award, but not robbed as in having your stuff stolen, hence keeping his jewellery.