Chimpanzees are cute as babies, but seem to become noisy, excitable, aggressive and quarrelsome when they get older. Of invertebrates biting flies and mosquitoes. Also the house cockroach, because it carries disease and likes to live in and around refuse - even in latrines in many countries.
Some people, dolphins, elephants, dogs, cats, mongoose.
Why? Because they are intellegent. I know one mongoose from documentary, who saved blind cub and gave him his food every time. When pride was attacked by predators he helped him survive - even was fighting for him.