I really did not see anything of this when I went to see both Mount Vernon and Monticello. At Monticello, you could do a tour that gives more of an in depth discussion about slavery, but I elected to do the garden tour (conducted by a lovely and knowledgeable lady, this one was basically all adults and the other one was filled with noisy schoolkids).
At James Madison’s Montpelier, there was mention and discussion of slavery at the place during Madison’s day, but it was also done in the appropriate manner and context.
What shocked me was, that they used "Ice Cubes" in his day, for summer refreshments.