<< You just gave an example of where my knowledge of English falls short. What
exactly is a "cop-out"? (It is not listed in my dictionary.) >>
In this case, it means a deliberate, intentional refusal to deal with the
full implications of the question or challenge; an implicit charge of moral
cowardice, basically. That he has asked a question, or posed a challenge that
you, since you cannot answer it, ignore and pretend has not been asked, or
give a totally inadequate response to. Basically, he is accusing you of
flinching, of ducking the challenge.
Tom Beck