Oh, I certainly would not advocate beheading muslims. No.
But I do wonder if we are too complacent and meek. And I would only suggest “acting the way muslims do” WHEN they do it to one’s face with no consequence.
Is it Christan to be humiliated and flee? No way.
But from a Christian perspective, a muslim, as we all are, is unclean. Would it be wrong to point that out after the other woman, the muslim, makes the point that she cares about being unclean? It is something the Christian community needs to answer. We are to be salt and light and running away is not doing that. The same problem is in our own society with the “political correctness” shoved down our collective throats. Has Christianity responded effectively? I do not think so. Do you?
That is the appropriate question. Jesus purged the Temple when the Lord was being offended by moneychangers.
Muslims offend the Lord when they treat the Holy Bible as unclean. Their offense must be encountered directly and strongly. The clerk offended the patron's religion, not the other way around.
100 Christians should confront this clerk and demand that she sell them Christian books. The clerk should then be required to apologize to the client she offended and especially to the child with whom she was so contemptuous, not as a matter of keeping her job but by the same PC laws that forbid offending Muslims.