Well, it's to be expected. He's just barely begun to make a name for himself, of course there's gonna be a lot of dumbasses that are gonna underestimate and try to mess with him. If MC doesn't get taken down a peg, then at some point people will remember that he's no chump you can just piss off...
The girl really stepped up to the game!
She did right, when an DPS acts like a douche, the healer should let them die a few times so they get the message.
I don't know if it's a miss-translation or if the content of the Novel was changed for the manga, but in the LN Jeanne says the exact opposite: That the Empress moves pursuing an Ideal, while Souma looks at Reality. Which is the truth.
And here i thought there was a bigger reason as to why he shouldn't use his full power, like a curse or something, not just the Pride of Nobles sht. That "ok, do as you wish" was a bit of a let down.