I think that's probably overstating it. Adams did, Franklin did, even Lafayette did. Washington however displayed an amazing ambivalence toward it throughout much of his life, but over time certainly came to regret both its inherent economic inefficiencies as well as the horrible moral truth about slavery. Like so many of the Founders who ardently fought for liberty, he displayed an amazing split personality on the subject (no one did more so than Jefferson). It is true that the issue of slavery, had it been pushed, would likely have derailed any attempt at forming a durable union and would have scuttled the Constitution. It was also an economic transition that would have ruined Washington and his contemporaries; perhaps the primary reason it occurred only upon the event of his death. Washington seemed to comprehend what needed to be done, and like many of the Founders, knew that the slavery issue was the elephant in the room. That they were not able to overcome this last impediment is regrettable and made the American Revolution imperfect and incomplete, and set the stage for the tragedy of the Civil War, but in all the annals of human history there is nothing that even approaches its success. What was accomplished by the Founders, and the one truly indispensable man, Washington, is nothing short of miraculous. The example he set is unparalleled, and the nation he founded has done more to advance human liberty than any other in history. Despite his imperfections - and he was a man, not a god - there is no more laudatory individual in American history and no one more deserving of honor and remembrance by his countrymen. That we fail to set aside a day solely in his honor is a scandal.
New Orleans changed the name of George Washington school because they didn’t want to honor someone who owned slaves.
They changed the name of the school, and renamed it after some African king from African history. This was supposed to honor someone worthy of honor. It probably allegedly helps the self esteem of New Orleans youth, who no longer have their sensibilities offended by attending a school named for a slave owner. New Orleans youth are very sensitive about the issues surrounding slavery. They are taught their history.