There's
this tumblr post about how humans are SO NOT the default everyman species, which then goes into considerable detail about what might make us horrifying to alien species. I reblogged and added:
"I have this head canon where we freak out the aliens who eat rocks because they think a civilized species eats rocks OR organics, and we put salt on everything. Then, we freak out the species that eat organics because carnivore OR herbivore and…omnivore is just NOT NATURAL. Plus, rock on our food. (shudder) Also, we’re completely irrational about what we’ll go to war over. Land, water, minerals…and the vegetarians are just SITTING there, letting the omnivores run amok. WTF, humans? (Humans are all looking at each other, rock/paper/scissoring over who gets to explain politics, religion and money.)"