My 4 y/o called me out

I was at burger king with the family. While waiting for my food to be made, my 4 y/o walks up to me, faces me and asks me at a normal loud voice "Is this your gun" While pulling up my t-shirt. I quickly pull my t-shirt down and say, No. "It looks like your gun" is his reply. I shush him and send him to his mother who is sitting with my daughter at the table. I acted as if nothing was said and kept looking forward. BK was running behind and had about 10 people in the waiting area. I dint look around for people's reaction. How should I explain to him so it does not happen again. via /r/CCW https://ift.tt/3xjRqRr