Actually, I live in Canada, so I use a mixture of UK and American spelling, depending on how I feel when I'm typing

I was more concerned for peoples' spelling in general, I wouldn't consider the trans-atlantic differences to be spelling "mistakes" but other types of spelling errors. But I can see your point about how it would be somewhat belittling for someone's spelling to be corrected it it took them so much time/effort to get it up on the screen in the first place.

I stand corrected scrap that idea, wouldn't want to hurt peoples' feelings