On the contrary, if you're going to hold someone up as a sage of the time, compare them to other sages. And you can take someone like John Dewey, who was
very well known in the early 20th century, or Randolph Borne as examples of people who were quite perceptive, as sages, and point that they were in fact openly explicitly anti racist. Quite a few of the socialist, social democratic and communist writers of the period had a public record of deep thorough social and political criticism that rivaled menckens sans racism. The "judge them by the standards of their time" can only work so close to our own time, or if you exclude those voices that counter your narrative.
Edited: Its also I think worth pointing out when someone who is held up a paragon of democracy, like Washington is, held views that were quite anti-democratic. If this persons vision of democracy was limited, should we not note this? Regardless (within reason) of the time? There were people publicly writing at the time of the American revolution that believed in an end to slavery, the right of woman and non-property holders to vote, etc. There was a reason that The Federalist Papers were written, it was assumed that the arguments for the adoption of the constitution and the government it would create were liable to lose out for a variety of reasons. We tend to collapse the range of debate that was happening at that time.