Sad to say, it is human nature to be uncomfortable with other races or even dislike them, particularly if they are very different from us. The contrast between humans and aliens are even greater. Therefore, the likelihood of racism against aliens is even higher.

It is hard to believe advancement of technology can change human nature. It is quite unimaginable that humans can shed their basic selfish and greedy nature and expect most of them to become kind saints.

What are some incidents of alien racism, if any, in Star Trek?

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    Can't write a full answer right now, but racism and anxiety is a huge plot point in many later episodes, especially Enterprise, but also in a few first contact incidents of Voyager. – Mario Sep 30 '17 at 6:13
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    In TOS there's a fair amount of prejudice against the Klingons, the TNG episode "The Drumhead" deals with fear of the Romulans, and a Starfleet officer mentions how certain species aren't meant for certain roles when explaining why he doesn't want to serve under Data...there is definitely still prejudice/racism in Starfleet, especially when it comes to species not obviously "sentient"...unfortunately I can't type up a well sourced answer but it's a start haha – VapedCrusader Sep 30 '17 at 6:19
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    @VapedCrusader in the Drumhead episode I think it was, it even goes further with trying to consider the guy guilty solely for the reason of having "romulan blood." Which I would consider racist (judging someone because of their "blood") but I keep being assured is just a normal thing in much of the rest of the world. – Broklynite Sep 30 '17 at 8:22
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    @PaulD.Waite - Spock's hardly the model of inter-species tolerance either. I always ascribed their jibes to good-natured banter rather than actual race prejudice. They clearly respect each other. – Valorum Sep 30 '17 at 12:37
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    I have to wonder if perhaps aliens wouldn't be so different that they just wouldn't trigger our "other tribe" reaction. They might inspire screaming panic, however... ;D – akaioi Sep 30 '17 at 21:03

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