It's funny because the word robot came from Czech robotnik which also means "slave".
So either way, it's racist.

I actually really liked the ending to this episode. Just the fact that they didn't have the childish cop-out where that one asshole would do a complete 180 and say that Tamaranians are super cool. I always expected it to happen, but no, he remains a racist asshole, and that was awesome.

And in Teen Titans Go, they'd probably re-do this scene but have Beast Boy make farting sounds in the background. Also the animation would look really shit.