I've stated in CR that I don't think light light green has any real cultural issue. It shouldn't be ruled out on those grounds. Red, on the other hand, has stronger connotations. Part of it comes from the fact that GUIs veeeery often have certain color standards, e.g.: Blue: "notice", "fyi", "please read me", "more info" Red: "stop", "ERROR!", "not allowed", "invalid", "failed" Green: "OK", "good", "approved", "success"
...think of all the GUIs text and icons (red exclamations/hands, blue question marks, green checks) you've seen and what the colors indicated. I think medium greens and pretty much all reds (maybe you could get away with faint pink) have hefty enough connotations that we should think twice about using them for diffs.
So I wouldn't say the color-connotation issue is just BS, but I don't think we should be overly cautious in trying to avoid colors that someone, somewhere, might interpret in some way, somehow, as good/bad. I think light green falls into the "neutral enough" bin. Just my two cents :)
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