User blog comment:Jkphantom9/Volume 3 Episode 5 Preview/@comment-25405817-20151204023012/@comment-24994749-20151205024931

Well, when it comes down to taunting, being cliche or original doesn't matter as much as getting under the other's skin.

Weiss is all about perfection, so telling her hee skills are subpar is going to get to her. She is also all about the family honour, so making fun of her family legacy is going to get to her.

Same applies to the "you need to get on a diet" thing. Calling people fat is as old as beauty standards. It still gets to people pretty bad.