Agreed.
However, unlike Paul TJ was not noted for humility.
If you spend your life preaching about the evils of slavery from a high moral platform, but make no effort at all to remove yourself from participation in the institution, it is not unreasonable to point out the hypocrisy.
Washington, OTOH, did not make a great show of opposition to slavery, but did spend his retirement getting his affairs in order so that all his slaves could be freed on his death, with careful provision for their training in a trade or support for the elderly.
I know which character I consider more worthy of honor.
Washington was peerless, no doubt.
But even Jefferson saw the inevitable harvest that must come of their compromise of their own stated ideals.
“God who gave us life gave us liberty. Can the liberties of a nation be secure when we have removed a conviction that these liberties are the gift of God? Indeed I tremble for my country when I reflect that God is just, that his justice cannot sleep forever. Commerce between master and slave is despotism. Nothing is more certainly written in the book of fate than that these people are to be free.”
Washington's movement towards emancipation and opposition to slavery was not foreordained. He thought long and hard about the issue, and grudgingly and slowly moved from a position of pro-slavery to one of anti-slavery. I just ran across this link last week. Fascinating reading. It is basically the history of his transformation.