While almost everyone is terrified of the dentist, they're usually more afraid of us. People can get rather unpredictable in those seats and the dentist doesn't want to harm the patient at all.
While you may find mascots rather annoying, they are actually pretty afraid of people. People are usually taunting and making fun of mascots. It's not uncommon for them to be insulted or to experience physical pain.
You can't help but feel squimish when you see an spider by you. You're first thought when you see a spider is to squish it and dispose of it. The thing is, spiders are much more afraid of us than we are of them. We have the ability to kill them rather quickly.
Your first thought when you see a mouse is to jump on a chair and scream your lungs out. The thing is, mice are pretty harmless to us. They're rather skiddish animal and they find us much more frightening.
Very few people love clowns and most can't help but be terrified of them. The thing is though, clowns are actually afraid of us. They have a stigma about them that makes them rather hated. They're open to insults and taunts just for being a clown.