I get told regularly at work i misspell favourite, colour, and so on... Of course i work in the USA so it is frowned on. Guess i just read too many books by British authors. But i do fine when i have to deal with our UK offices.

I agree with color being subjective. As someone who is partially colorblind, and my grandfather was monochromatically colorblind(only saw in grey scale) it is difficult to talk to someone about color when my interpretation of colours vary from theirs sometimes greatly.