Yes, that pic shows the watermelon salad being sold in the museum cafeteria, and they're not even subtle about the racism, as the label reads ... "Juneteenth Watermelon Salad."

One ticked-off patron's reaction to the shocking menu item was, "No joke!!!"

A rep for the museum is defending the salad, saying its food service partners "planned a Juneteenth menu as a way for us to raise awareness of the holiday's meaning, and commemorate their own family traditions."

While that makes it sound like the food service company is Black-owned, we haven't been able to confirm that yet.

The rep also says "Red foods have historically been served by some to remember the blood that was shed along the way to freedom." We've never heard that one before, but okay.

They did offer a mea culpa though, saying, "The museum apologizes and acknowledges the negative impact that stereotypes have on communities of color. We have removed the salad from our menu. We value our relationships with all of our visitors and communities. We have learned from this experience."

The museum -- which is throwing a "Juneteenth Jamboree" -- correctly states on its website that Juneteenth is a holiday commemorating the end of slavery in the U.S., and is also called Emancipation Day or Juneteenth Independence Day.