While I don't have a preference for text with color tags added in, I do like it when the text happens to be a color that I find particularly easy on the eyes when placed against the color of the background. As for when the text is a color that I find harsh on the eyes or hard to see at all against the background color, I simply copy the text, paste into a document to make it black against a white background (which my eyes have no trouble with), and read it there.