Yeah, there is that crowd out there too. You hear a lot of stories from people who are trying to remember events from 30-40 years ago and get things mixed up, like telling you about a friend of a friend who drove a wicked cool Mopar, a Dodge Fury, that had a totally built 454... or something like that.

And yeah, you can stand there and say "hey pal, first of all Plymouth made the Fury and not Dodge, and second, 454s are a Chevy engine, not a Mopar", but I prefer to cut folks like this a little slack. I've found that most of these folks are mid-life crisis guys who are at the show because they are thinking about getting into cars now that they're older, and their experience with these cars came more from friends of friends than from spending time around cars themselves. Then you also have the next gen folks who are repeating stories they've heard from their dads, uncles, older neighbors, etc., and they were either told the stories wrong or they're getting them mixed up in their own minds.
My take on these guys is whatever their motivation is, they've taken the time, effort, and trouble to come out to the show, and since they're standing here talking to my wife and I about our Road Runner, they've obviously seen something that peaks their interest, so what does it hurt to talk to them and enlighten them a bit? Instead of calling them out and saying "Dude, the 454 is a Chevy engine" and making him feel dumb, I just start talking about how my car was originally a 318 car and someone along the line put a 360 in it, and then tell them how I'm upgrading it to a 440. Who knows, that might just be the discussion that convinces the guy to move from relishing the stories he's heard from others to getting his own car and writing his own stories.
The only folks who really annoy me at shows are the purists, who I usually don't have to deal with because my car is just so utterly freaking and blatantly non-original that they don't feel compelled to come by and try to nitpick me on having the wrong bolt head or washer on something, and the trophy chasers, who like I said before are usually playing with their instashine and rags all day while they wait for the awards presentation... and who BTW tick me off when they make a big show of leaving immediately after the awards for their class are handed out rather than stick around and congratulate all the winners. To me that's the rudest behavior of all.