Personally, I think the mistake was taking your gun out without warning or asking if the wanted to see how you CC.
I was over at a friends house one day eating lunch and the talk turned to CC. He knew I had a CWP; but had never been aware that I carried all the time.
Friend; "How often do you carry?"
Me; "All the time"
Him; "Are you carrying now?"
Him; "You can't possibly be concealing a gun on your person dressed in shorts & t-shirt; let me see!"
I lift the front of my shirt and show him my 24/7 sitting AIWB in a CBST.
Another friend of ours, (a preacher & Hospice councilor) was also eating with us and said he was also CCing. So, we began to show him our CC rigs.
As it turns out, our friend is the only man in our "circle" who has yet to get his CWP. He says he just doesn't have the temperament. (But, I think the real reason is his wife is AG and makes him keep his one pistol & two long guns under lock & key; with the ammo stored in another room.)