I think the difference has to be with Com's persona, and how he is perceived, versus someone like the Roots or Mos Def. Some cats think Com carries himself like he is enlightened, wise and tolerant, so anti-gay lyrics seem like hypocrisy in that light.
Although Mos and the Roots might be accused of the same thing, for some reason I don't think they self-project this sense of enlightenment or wisdom to the same degree that Com does. I dunno how to verbalize it better than that...
But those cats, really almost every rapper, has made anti-gay comments at one point or another. I think people like to pick on Com because of what may seem like "holier-than-thou" persona, same thing with Lauryn.
peace
Iz
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"I am the IZ equals IZ..." DOVE
"I don't give a fuck who you are / so fuck who you are" STYLES