It is to bring to mind the secret reasons we may deal with people in the first place, or some rather than others.
Many times, people speak to females because they are females, particularly if they are pretty females in some way (which is of interest to males, even if they pretend not to be interested in that way, they are after all animals).
So the point was to bring to mind what reason one might have for even caring what the obnoxious seeming girl says? What is she worth? Why should she be brought to paradise or helped? The Qur'an says to ignore the contentious disbelievers and leave them aside and let them say and bark what they will say and bark, they are not worth a thing and Allah can create others who are better than them.
So I wondered what her value is that she even deserves much effort since she seems rather insistent on her prejudiced ideas.
If she is pretty, maybe then she is worth something more to the man, even as "eye candy", otherwise she is just some deformed mutant insulting Islam and needs no apologetics, her course and destination in hell should be happy news for us.
So the question of this thread was "how would you answer", and if she is ugly I would answer "oh, well I'm not sure all Muslims are the same, but who cares? Enjoy." and "Are you interested in becoming a Muslim or learning more about Islam? No? Alright, bye".
Why work on an unattractive girl or a girl who has no apparent talents or skills who is acting as an enemy of Islam?
Ask "Are you good at anything at all? What are you good at?"
If she lists some things, ask her for proof if appropriate, find her uses. If she is useless, then why even waste time with someone who talks the way she does? Such an ignorant fashion would not apparently make a good soldier of Islam or representative or speaker or anything.
"Are you willing to learn and promote Islam? No? Alright, have a nice day."
That is why I said "is she pretty?", I wanted to bring up this topic of reasons to reject the injunction of the Qur'an to leave off people who say stupid things regarding Islam.
I can understand working on a pretty girl though "Oh, I see the only thing of apparent value about you is that you are attractive to me, let me take some time to discuss with you if these beliefs are what are really causing you to reject Islam. I'd like you to become a Muslim so that I can have sex with you, or at the very least, have you join our ranks in paradise."
haha. Sorry if I'm offensive.
Generally, their hatred of Islam is just plain racist and regarding depictions of "darkies" on TV.
They would sell their souls for money or anything else, and even quicker for evil. As you can see, I don't have a particularly good impression of human beings, or kaffirs.