system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why aren't other animals as freaked out by bugs and creepy crawlies as humans?

Are we the only ones afraid, rationally or irrationally, of bugs?
gpt
Fear is generally a learned response in humans rather than being present from birth. Whenever a human is observing another human as being a role model, the observer sees the response taken by the role model, and is more likely to recreate that response in the future. Because of this, it's easy to pass on your fear of bugs to another person, as long as that person's subconscious processing thinks you are worth learning from. 

On the other hand, some fears are present from birth as a defensive response to tell an animal to run away when presented with a dangerous situation. Most animals don't fear bugs simply because bugs don't do anything to the animal. But if you put a cucumber behind a cat while it's eating, it will panic and run away because it is born with a fear of snakes, and the cat's innate processing mistakes the cucumber for a threat. 

It's likely that our original fear of bugs did come from the knowledge that certain bugs can have bad or even deadly effects on us, which then spread the mentality that we should be afraid of all bugs. For an animal to fear that same bug, it would have to be because of a survival instinct, unless the animal somehow also learned to fear bugs.

Edit: apparently the cucumber/snake thing with cats may not be 100% scientific, but it was the first example that came to mind when thinking of innate fears.