Too busy getting stoned in your glass house, to kick rocks
Em makes a play on words here with the famous saying “People who live in glass houses shouldn’t throw stones”. Since Em is the Kryptonite to hypocrites, he refuses to let his critics call him and others out (“throw stones”) because they aren’t much better than the people they are criticizing.
Em plays with a few more idioms here. Getting “stoned” means getting actual rocks thrown at you in the Biblical sense, but in this case it means getting high off drugs. Since Eminem and his drug addiction was well documented by the media, he might be calling out the media members with drug problems that loved bashing him when he hit his low point. And keeping up with the rock imagery, telling someone to “kick rocks” is basically a polite way of telling them to fuck off.
This could possibly be an underhanded diss at Cage, the underground white rapper that came up around the same time as Em and accused him of stealing his style. He dissed Em multiple times and then got bitter when Em dissed him back then made it big time; he also has a song titled “Kick Rocks”.
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