Quotes: Embarrassing Nickname

Wally: From now on, my nickname is 'The Wizard', it speaks of my guru status.
Alice: I think I'll call you 'The Lizard', it speaks of your small brain and lack of ambition.
Wally: Please don't.
Alice: Let's see which one catches on quicker.
Dilbert

C'mon....c'mon. Anthony Bologna. (Beat) You and I both know that guy's name is Tony Baloney.

Tails: Mettie!
Meta Knight: I told you not to call me that. I still don't know what possessed you to design such a nickname...
Super Paper Mario X, Chapter 47

"OK, pause and fucking reload. My name is not Karkitty."

Kim Sung Young: Hatchetman!
Hachiman: Hachiman is my name. I find the other sobriquet... distasteful.
Punisher #9

Kagura: Hey, Jinny.
Jin: Stop calling me that!

Buford Tannen: "Mad Dog"? I hate that name. I hate it, you hear?! NOBODY CALLS ME "MAD DOG"! Especially not some duded-up, egg-sucking gutter trash!

Dio Brando: It didn't cross my mind until now, but Jojo's a nickname, isn't it?
Jonathan Joestar: Yup! It's a contraction of Jonathan Joestar.
Dio: Hmm....
Jonathan: What?
Dio: Do I have a nickname, I wonder? The thought simply strikes me as comical.
Jonathan: Ha, you want me to give you one?
Dio: That's not what I had in mind...
Jonathan: You do want me to!
Dio: No, I don't...
Jonathan: Dio Brando... Brando... Chanel!
Dio: Chanel!?
Jonathan: Well, if you contract Dio Brando, you get Debu.note 
Dio: Debu?!
Jonathan: Isn't this great? Now we match!
Dio: I'm-I'm fine with Chanel—
Jonathan: De-bu! De-bu!