Hahaha, yeah a lot of times people don't use the right terms. I don't like to correct people very often because I hate coming across as a know-it-all. I LOVE black and white paints and often look at the online horse sale sites. The most common things I see that crack me up are: "black & white" (when it's obviously BROWN), "medicine hat" paint (that is tovero usually), "tri-color" paint (tobiano), "stands 15.4h" (or something similar 15.5, 15.6 etc). Now I'm not trying to knock anyone, just if you are going to own/sell a registered horse, wouldn't you try to know something about it, or at least seem like you do?
Weefoal has given me some education here on the types of color "pattern" genes. I know about lethal white and sabino, but she is obviously quite knowledgeable about the specifics. I have studied color genes for breeding purposes for a long time to target specific coat colors (I don't care much for red horses). So basically the point is - those people irk me that will just throw some data at you without really looking into it. And you said they were breeders to boot.... *sigh*