My employer doesn't allow weapons at work, but my coworkers know I am "gun friendly". Some are OK with it and some choose to make a point in any given conversation to voice their concerns about my safety (or that of my children) around my firearms.
Had a funny moment recently when one of the gals introduced me to a patron as a "Pistol Packing Momma". Turns out he was an INGO member and we knew a lot of the same people. We had a nice chat and after he left she looked at me and said "I didn't understand a thing you guys said. It was like a different language." I guess the joke was on her.
Maybe you should counter with, "What, you DON'T carry around your kids? Don't you care about them? How will you protect them from harm if a crazy comes into the grocery store? Throw celery at them?"