I was at a flea market one time. Some old guy had a couple of chickens in a cage, one of them a big Barred Rock rooster, and though I didn't get too close to those birds, as I never want to do that at a flea market, most seeming less than healthy, I said casually, "Nice big Barred Rock rooster you have there." He was astounded and said, "You know, you're the first person all day who has called that rooster by the right breed name! Everybody else called him a Dominecker."
 
Had a big disagreement with a woman manning the counter at one of the feed stores. Apparently, Privett hatchery mislabeled a group of Barred Rocks as Dominiques, though the label was written "Dominecker". Looking at a sea of single combs, I informed her that the label was wrong, that they were BRs, seeing as how I'd bred them for years. Even upon picking up a book of chicken breeds next to the brooder and showing her the difference, she was dubious because some FFA kid hadn't noticed anything amiss. 
 C'mon, if I know 
anything, I know my BRs. You cannot fix
 willing ignorance.
 
 
Some of it is that folks have no eye for detail. They call a Delaware a Brahma or a White Rock a Delaware, etc. Some just see a striped chicken as a Dominecker,  no matter what else it has, white legs, single comb, whatever.