My wife isn't a Yankee but she does have some similar tendencies growing up in massive cities in Brazil (Rio and Sao Palo) such as stopping in front of a door at a restaurant waiting for a doorman (with everyone behind her waiting)... I have to wiggle my way though the crowd to open it for her.. She doesn't mean to be rude but boy, folks in Texas give her funny looks.
And how they complain about the heat, and the lack of a good deli, and the lack of mass transit, etc.
But if you want to make them a might uneasy, you just flash that concealed carry at them and they pipe down real quick like.