May we know a few things about this Catholic? Does he or she has any credentials of his/her authority to teach? Is there any reason to think that he or she speaks with any authority about Catholic doctrine. Do you think there's some scholarship here?
I would want to here the exact wording your friend used. But God is the source of every good thing. TO imagine that any fallen human could come up with a truly good work without Divine Favor is nuts.
Mad Dawg is the person to ask. The one with all the answers.