Yes, I'm all for these types of lessons. This experiment, which was very hands on and let the kids feel what something was really like, was exactly how kids should learn more often. It reminds me of the harsh and real nature of the After School Specials which dealt with tough topics in a way kids could empathize with in the 70's.
Now in today's, gentle, overprotective, hover-world, racism is rampant and people are more ignorant than ever. Sure, many are still teaching good lessons, and many have evolved, but huge masses of people are still dumb as rocks and hating their fellow humans based on skin color and ethnicity and religion as evidenced in the crowds gathered and chanting hate speech at the rallies for a certain popular presidential candidate.
But it think there still are lots of people who would approve of this lesson, and back then it was accepted because people did that kind of thing. Not everyone liked it, but it was before the science denying mindset had set in. People were less offended by ideas and experiments. But there are still people who do this type of thing too, and who would let their kids participate.