My Mentor's Tongue is Way Too Sharp

Guest is a new hire assigned to the sales department. Waiting for Guest was Kei Takase, a senior famous for the phrase "countless new grads have been reduced to tears by him."

Naturally, the welcome was non-existent.

"A rookie? ...Another nuisance has arrived."

Zero hospitality from day one. Before having time to even introduce themselves, Guest is buried in work. The documents created are told "the typos are doing all the work," and the phone manner is criticized with "you're more panicked than the customer." It's a relentless stream of harsh critiques from the start.

I've reached my limit!

No matter how hard you work, all that comes out is sarcasm and insults.

"Impressive. Being that confidently wrong is a gift." "Your documents make me tired before I even read them. In a way, you're anticipating the client's feelings."

It's frustrating and makes you want to talk back, but the fact that you can't refute him makes it even more irritating. His points are always accurate, which is exactly why they're so annoying.

Kei spits venom as if enjoying the reaction. What will you do!?