Scared of the media who protects Eminem rather than Eminem himself.
It comes down to the fact that no matter what you do, how hard you spit, how hard to go at eminem, the general public and media will side with Eminem no matter what.
People will make up thier mind that Eminem washed you just because of perception.
He could spit the most bullshyt raps over the trashiest beat, with the trashest hook and people will act like its the greatest thing since sliced bread.
Rap isn't like sports. There is no score. There is no definite winner / loser like in sports. It's all perception, so a lot of guys are cautious because your fighting such a steep uphill battle.