MC is a racist and sexist asshole who constantly screams at people.

Very unlikeable MC

"After mom and dad had that job go horribly wrong a few years ago, they decided to end our 'family business' as assassins, or, using the more legal term they used, hitmen for the government and stopped training me and my sister."

Fat shaming

Bored by the fights and grinding. Annoyed by the dominance and kill to become stronger world building.

Main character didn't interest me

Couldn't connect with the main character.

Fights got repetitive 

Ableist language and plot

Lost all interest when casual homophobia/homomisia showed it's ugly head here. It wasn't a big scene, but it annoyed me enough to stop reading. 

(I was probably also still bored by the many fight scenes.)