>>5991763
Anon, those are two black people going at it, it's funny.
The humour lies in how Asuka is a bitch, and Rei isn't, so that's why it's funny when Rei snaps and destroys Asuka. It's deserved and a reasonable crashout for Rei to have.
Even Anno did it in the audio dramas in the 90's. Rei eventually gets tired of Asuka seething about how Rei is the most popular, and so Rei ends Asuka rightly, slapping her to death.