I too have read before that genetically, the majority of humans have inherited the fear for things like snakes.. there are certain living beings that make your skin crawl, give you goose bumps, or make you jump if they catch you by surprise.. These may vary between individual, but there's usually a common fear people share like tarantulas or snakes (yes, a certain portion of the population is chill with them).. This is genetically inherit, from years of nomadic living and survival purposes. It's a defense mechanism: https://www.nationalgeographic.com/news/2017/10/infant-fear-phobia-science-snakes-video-spd/#

Imagine you walked into your apartment or home or bedroom, and were surprised by a gigantic furry tarantula, or a small kitten.. Your reaction would vary greatly, even if both were harmless to you.