Also, most primates hate and fear snakes and other reptiles, but I feel that the fear of them by humans is more of a cultural matter in most cases (I know true phobias exist). Back in ancient time, differentiating venomous and non-venomous snakes was hard, hence creating a generalized fear of them for many cultures, but let's not forget that many civilizations, like the Ancient Egyptians and Hopi Tribe, worshipped snakes as benevolent entities, including (sometimes exclusively) venomous ones! And yet other cultures, like the Maori, were fearful of harmless reptiles like Tuatara in their case. It's all very complex, and it may have to do with the fact that society gravitate more favourably towards mammals and disfavourably towards the others, gradually getting worse the "further away" they are from that clade.