This isn't pissed off. She just is merciless, even when the other party doesn't even show the will to fight...
Sorry, but this Reimu is just an arsehole, no excuses.
This is kinda late but that's typically how canon one acts
By Canon shes honestly quite the dick
But unlike this one at least canon one is somewhat still a good person with her moments
Its just her default way of thinking is quite unsavory
You who lived away from humans for the sake of gathering misfortune!!Pl-Then you were so infatuated with him you neglected your duties!!And because of that I was shifted the responsibility to come here!!for such a worthless fucking reason!!!Please stop-Don't you give me troubleBecause of your fucking game of love...I was forced into this shit!!Just because it was your first time having a man treating you with kindness that had you floating on air!!Have you fallen in love with that man!?A self-made doll like you!?