I have no trouble chatting with people, however, if a car topic comes up an average person's meager (if you're lucky) grasp of mechanics pretty much precludes any conversation.
MOST RECENT EXPERIENCE: After passing NJ Inspection I, with my BIL, chatted briefly with a woman who's car had just failed.
She had a code which pointed at the upstream O2 sensor.
I mentioned that her 140,000 mile old Chevy might just need a new sensor as the "upstream one always goes first" but a code can be "from a working part that reported it".
"Vacuum leaks and immobilized parts can cause codes", I said.
My inclusion of these other possibilities left her blank.
I didn't want to alert her to the fact that her engine bay was filthy and appeared horribly neglected.
She needed a friend.