I get what you're saying, but regardless of whether Eminem took the bait or not, MGK gets what he wanted.
Eminem doesn't respond - Eminem's scared to go after someone who keeps taking shots at him and has even crossed the line with his girls. Check out [video link] for more details. Etc....
Eminem does respond - What is MGK going to do now? Stay tuned to the next installment of Eminem vs MGK 2018!!!!
The line where you say he's lived his entire career off controversy isn't quite true either.
My first CD was Marshall Mathers LP. I quickly bought the Slim Shady LP and EP.....might have downloaded that EP.
I then downloaded Infinite - an album I don't know if many people know of. There's not a whole lot of controversy there. It's just some guy with so much on his mind putting it all out there in words with a beat and some convoluted rhyming patterns.
8 Mile - the soundtrack not the movie, was yet another one where this guy just oozes talent on the mic with his storytelling.
It's true that Slim Shady is the fun one to listen to when he's angry and has a message for someone. It's also the bats.... crazy guy from Amityville, Kim, 97 Bonnie and Clyde, Kill You, Till I Collapse, etc....
Slim Shady is the alter ego who wants to throw bombs at everyone. He'll say anything at any time and couldn't care less about the repercussions. It's an alter ego, he doesn't exist in the real world.
Eminem is the silly jackass that comes out with stupid songs like Drips, Just Lose it, My Band, Purple Pills, and others that are equally fluff.
Marshall Mathers is that storyteller who has a lot to write about and wants to let the world into his past, present and hopes for the future. This is also the guy that has a political conscience. Infinite, Stan, Marshall Mathers, Drug Ballad, Mosh, Like Toy Soldiers, Mockingbird, etc...
I remember the interview with Anderson Cooper. A relatively shy guy who has an impressive grasp on the language and ways to manipulate words and sounds to create a picture far outside the scope of the written words on the page. He's admitted that had he not been a rapper, he'd have ultimately become an author.
Don't sell the guy's pure talent short. Yes it is true that he's never shied from controversy and has very often chased it. He's also much much more than an attention ..... you know, as opposed to the majority of those same people who stir stuff up constantly to distract from their complete lack of talent.