Actually, it is good to know where these jackasses stand. I would rather know my enemy then not. Not knowing an enemy can get you stabbed in the back.
Eminem was just trying to draw attention to his dead career.
But on the actors (who make a living being someone else as they play their parts) musicians and athletes getting political,methyl should I care about your opinion?
As Frank Zappa said - shut up and play your guitar. Clear and to the point.