I was rather unhappy with an edit to a post of mine (which I immediately rolled back as soon as I saw it). While one may debate about whether mannonic acid or mannuronic acid is formed in an oxidation of that type and the first equation was (deliberately!) incomplete I was especially unhappy about the changes that turned oxidise into its corresponding American (or Oxford dictionary in this special case) spelling.
Community consensus (which I fully agree with!) is at present not to change a post from one flavour of English — i.e. British, American, Australian, New Zealandish, South African, … — into another while editing. Please respect writers choices of English. See also the title to this question.
Note that adjusting misspelt words to the majority flavour is encouraged. So if a single colour is missing its u while everything else is clearly in British English, editing in the missing u is desireable.
A second motivation for writing this post is a recently suggested edit that included the following edit summary:
Comment: Spelling - when in americanized spelling, it's more popular in search engines = more traffic to question
See the following image of a Google search I performed just a few minutes ago to see that that is blatantly wrong. Search engines automatically substitute either forms for each other (and they are even great at ‘recongising’ misspellings and suggesting corrections for them, too).