In chapter 86 of Shokugeki no Soma as Yukihira was about to start whipping up some mad beef stew, this happened (roughly went like this):
Soma: You were Tsunozaki Taki senpai... right?
Tsuno: Huh? (What's with this guy?! He just went and talked to me normally!)
Soma: It seems you've been saying lots about me. I'll listen to your complaints, after I finish serving my dish!!!!
I've read through this bit quite a few times, and I still have no clue what Soma is referring to when he says "seems you've been talking smack about me". I didn't even know she existed until that chapter. Maybe I'm missing something crucial?