system
Given the following post, respond as if you're commenting on Reddit:
human
[General sci fi] In some sci fi universes, why do some or most alien races or civilizations tend to look down on Humanity as if they are the only race in the universe that can do wrong?

And in some cases using the words "primitive" or "underdeveloped" in such a way so as to form of insult and illicit an aggressive response.
gpt
In much of fiction, humans are to other species what rats are to humans. We breed faster than them, we can adapt to eat anything, we can survive in a huge range of environments, and we're *just* clever enough to mess with stuff we shouldn't without being smart enough to really know what we're doing. 

Our relatively short lives cause us to live more intensely, so we act rashly and tend not to think - or care - about the long term consequences. We are fiercely independent, so we often refuse to do the right thing because an authority told us to. We're also fiercely loyal to our kind, so, paradoxically we will unite for a cause we believe in and fight to the death for it. 

We are unpredictable and irrational. We are also creative and insightful. We build technology and integrate it rapidly without fully understanding the implications of it. We are violent and tribal, turning pretty much any technology available into a weapon somehow. Our minds are plastic, able to be shaped by our upbringing and environment so we can absorb and assimilate new ideas quickly and easily. We are also still primitive and nostalgic, clutching our base instincts and unwilling to fully integrate or accept ideas that we don't like. 

And there are billions of us. Billions of minds ruminating on the status of humans in the universe. Billions of thoughts creating memes that could become viral and spread through the collective human psyche. How long until one of those billions of potential terrorists convinces humanity to follow them in war to conquer the universe? Aliens, in their arrogance don't believe we would succeed - any more than you would believe that rats can take over a building. But we would cause so much damage in the attempt! 

Or well meaning human will experiment with a tech they don't understand and accidentally turn it into a dangerous weapon capable of destroying entire planets. And then accidentally set it off. 

Humans are dangerous. Humans need to be controlled, kept confined and limited so they can't wreak havoc across the galaxy. But of course, putting us under pressure like that only pushes us harder. We bizarre creatures *thrive* under pressure. Lock us down and we become *more* violent, *more* creative, *more* focused.

Aliens in some fiction try to eradicate us, but find that we our evolutionary lineage is the one that survived six, seven, eight?  mass extinctions and we aren't easy to wipe out. We hide and we steal and we learn, and we fight and bite and claw. Others try to use our talents, keeping us around because they know exterminating us isn't an option and hey, we can be useful. Let us tinker and discover. But we still refuse to be controlled and limited. We break limits. 

So the smartest aliens just let us do our thing and work along side is, peacefully, but with a wary eye in case we get into trouble.