Does your gun have a silencer, and how good of a shot are you?
Yes, I'm joking...
Stay concealed, you should know how to do that. I doubt that someone is going to run screaming...probably will first think that you are a cop.
IF.........'said' individual should begin screaming, ignore him/her and continue shopping if you did nothing wrong.
Stay armed...stay concealed, ignore idiots...stay safe!