Good Vs. Evil,
Truth Vs. Lie,
are religious terms.
Thus, an atheist has become free from these old traditional ways of thinking.
Atheist: "there are very Good atheists."
So, now we all agree, that there is Absolute Evil and Absolute Good in this world?
Atheist: "No, we don't."
So, there is no good in atheism.
Atheist: "Maybe try not to equivocate words like good and Absolute Good and try to have an honest dialogue."
I have the God given right to say anything if there are none of the absolutes. But there are absolutes. So, I stay by the "there is no good in atheism."
One possible way to interpret the claim that there are "good" atheists is simply that the behavior of some atheists is in accordance with what the culture judges to be good. So, it could be extended as "There are very good atheists, as is defined by people."
Similarly, depending on the context of the discussion (say, whether atheists should go to hell or not), one may be saying, "There are good atheists, namely, those atheists whose behavior is in accordance with the basic Biblical laws -- e.g., thou shall not murder, lie and commit adultery. So, they don't deserve to go to hell."
In either case the atheist doesn't have to admit morality is objective (i.e., that it exists outside of human minds) or absolute (viz., true always and everywhere).