He's teaching you that reading white text on a dark background is actually harder to do and strains the eye more. Consider his comment your education on the us

He's teaching you that reading white text on a dark background is actually harder to do and strains the eye more. Consider his comment your education on the usability/readability of different contrast ratios (a pretty well-reasoned post on the topic here: http://www.456bereastreet.com/archive/200608/light_text_on_dark_background_vs_readability/ http://www.456bereastreet.com/archive/200608/light_text_on_d... ). And consider my comment your education on how your tone can be annoyingly preachy and smug.