I included the "[sic]" NOT because I thought he misspelled the word, but because the overwhelming majority of my readership is here in America. I am well aware of the difference of spelling here and across the pond, and while "[sic]" is normally used to denote incorrect spelling, that is not always the case. From the Merriam-Webster website:
"Sometimes the quoted text contains an error of grammar or spelling, but other times it might not contain an error at all, but some kind of language or phrasing that might be unexpected."
Next time, perhaps it would be best if you asked *why* someone does something before you castigate them for doing so.