Quote Originally Posted by Random View Post
That is a human tribal response.
It has nothing to do with stereotypes.

When we don't understand something completely we turn the things we don't understand into "Them" and all of "Them" "Do the same thing" because our experience is so limited.

Sci-fi isn't written with psycho-analysts directing the plot. It's written by "normal" people generally. People whom don't realize this tribal characteristic being played into their fiction.

So basically that is why any stereotype exists. Lack of understanding. If the creatures written have a pre-canon background that is diverse you almost always lose that "all the same". See>Farscape.
I was referring to racial stereotypes that people create for each other, which are the RESULT of said tribal mentality. I'm sure in-universe the different races have their own stereotypes for each other. In any case, I'm not against some shared cultural traits; it makes sense that some would develop due to a shared background. A large canon background is not always a guarantee against lame generalizations, though. Just look at how thick Mass Effect's codex is, but most of the aliens you encounter are nothing but a composite of their most distinct racial differences to "the norm".