My advice is each time some calls a red cat orange, just ignore it. Don't make a response about how its not an orange cat but red cat. Reacting to it just makes it worse, you're pretty much telling that part of your brain that its okay to let it trigger your anger or anxiety, when your brush it off then it tells that part of your brain "who cares." That method always works on my pet peeves.
On another subject, I think people aren't really thinking on correct coloring terms when they talk about a cat's color, they see a cat that's about the color of the pumpkin they think orange because on the color wheel that's what the color would be called. If I saw a rest colored cat, I would call it red because it is, but if I saw an orange cat, even though I know the correct cat color would be red, I call it orange because 1) as mentioned, that's what the color would be called on the color wheel and 2) most people would say, "that cat's not red, its orange" because most people don't know that's what an orange colored cat is called. Of course I usually just call a red/orange cat a Ginger cat anyways because then everyone knows what I'm talking about.
Other colors on a cat are the same. A gray cat may be correctly called a blue but when generally speaking, the color makes sense for most people when you just call it a gray cat and on the color wheel it would be called gray (though there are some shades of gray that can be considered a shade of blue.) As far as Chocolate and seal colors, if you're talking about a color point on a Siamese or other pointed cat, most people would know what you're talking about, however if you called a non-pointed cat, seal. A lot of people would look at you weird. Chocolate is a little different because many people use the word chocolate as a synonym of brown because it sounds prettier. Anyways, speaking of terms on actual colors, techniqually, white or black isn't a real color too. White is the absence of color while black is all colors, so if you get upset with people calling a red cat, orange, then you should get equally upset when someone calls white a color.
You can also use that reasoning to help with your problem, each time you start getting angry you can tell yourself that you don't get upset when someone calls white a color, why should this get me upset.
. She called her kitty "orange" all the kitty's life, until she met me 
. Even after I gently corrected her, she had trouble, for quite a long while, even thinking of her kitty, or even my Tolly 
I agree 100%! I love the grey ones too!
