Why do rappers never mention Eminem in songs?

[Blu]

The only time I've heard an Eminem name-drop/reference was in Jay-Z's "A Star Is Born":

Wayne did A Milli, 50 did a milli
Ye too, but what Em did was silly
The white boy blossomed after Dre endorsed him
His flow on Renegade, fucking awesome
Applaud him

Other than that, I haven't heard a single mention of Eminem in other rapper's verses. Not even Nas bothered to mention him in the beginning of his verse on "Hip Hop":

And if I cry two tears for her
That would be the most that I can give to her
I am Joseph, Darryl, Jason, Dr. Dre, O'Shea
And a host of those who passed away
Today I'm Drake, I'm Wayne, 2 Chainz

Rappers always give props to Eminem in interviews, but on actual songs? Seems like they all disregard Eminem.

[DƎRDYPK]

because you don't listen to any, rappers don't mention Eminem. they try & rap like him

[PAINKILLƎR]

What about Lupe on All Black Everything?

[King Lance]

Nas - ether "and eminem murder you on your own shit"

50 Cent - In Da Club "When you sell like Eminem, you get plenty of groupie love"

Dr Dre - Still Dre "Kept my ears to the streets/Signed Eminem"

Tech N9ne - Why they ain't callin me?

"I would have loved to have been on the third verse of renegade
That's why I'm like a stick of dynamite with no stem
That's why I got d-12 but no em"

[PAINKILLƎR]

On the block white selling like Eminem

A dope Common line, wait does this count?

[Dr. Shady]

asher roth did a whole song about em
crooket i in skeletons says ''behind Em I had the drunk face''

and more and more

the game mentions Em in ''lets ride'' as well

[King Lance]

What about Mariah Carey ?
oh wait, she isn't a rapper

[Blu]

I was talking more along the lines of...giving props or respect to Eminem.

Jay-Z is admitting that Eminem had the better verse on "Renegade", which is huge props; Nas is saying that Drake, Wayne, 2 Chainz, are the ones representing hip-hop and that's pretty huge as well.

[Snakebeast]

Nas on Tha Carter 4's Outro.

"Inspired lyrical tyrants like Kanye West and Em"

[whiteamerica2]

"Em before 8 mile" dumb out by joe budden

[PAINKILLƎR]

That Common line is him recognizing that Em sells so it kinda counts. :/

[PAINKILLƎR]

I guess I'm like the black Marshall meets Jay

That's gotta be good right? I would say so.

[Table]

Lowkey in Albhabet Assassin:

"Cause Everything is Everything it's Evidence my Essence is Every Element, Effortlessly Edit your Enterprise with Eloquence. Elevate with the Energy of Eminem, Every Entity that's Ever been a Enemy I'm Ending them."

It could be because rappers don't want to come across as dickriders giving shout outs to someone already at the zenith of popularity -shrugs-

[AbramIsaac]

I would disregard the people actually signed to Shady/Aftermath. Listing them seems a little too predictable.

[Squiggles123]

Macklemore mentioned Em in "White Privilege", though he wasn't giving him props:

"The face of hip hop has changed a lot since Eminem
And if he's taking away black artists' profits I look just like him
Claimed a culture that wasn't mine, the way of the american"

A few Aussie rappers have given Em props but no one here would probably care :P

But like someone said earlier, giving Em props almost goes without saying and its not like he's under appreciated and needs it (possibly debatable)