He is disrespecting an artist on his own label and someone he once said he admired. It's in poor taste and no doubt Common would be offended. Futhermore since Common is on his label, he would have final word as to when Common's album is released. So what the fuck Kanye? It seems like he's the type to put other people down to make himself look better.
Kanye is a douche bag; I really dislike his character.