Why people hate Kazuya? he is a normal boy, one of the most "normal" MC that i have seen in romance manga, he doesn't need to be the badass MC or the naive harem MC... he is just normal and that's good
In this chapter he showed how thoughtful he can be, and if he ends up dating Chizuru for real it will be awesome because trough all the series he has showed how much he likes her and how far he can go for her to make her happy.
Yes, he can be a bit of a pervert, a bit of a coward or an indecisive guy... but what normal man is not?
I think they will go with the Chizuru revealing to her Grandma she's not dating Kazuya... and then Grandma will say something like "But you like him, don't you?" making her realize she does like Kazuya