That's your opinion, and it's not a matter of whether he's improved in your opinion it's whether or not he's changed.
You don't have to like a character to acknowledge character growth.
Bakugo is supposed to be Deku's foil.
Bakugo became more interesting later on- I mean, he's had an interesting arc, but I still want to see him taken down several more notches. Deku is definitely growing and becoming better able to stand up for himself, which makes me smile!