The man blinked at her so innocently, that Su-Jin suddenly felt guilty.
How could she have accused him of having ulterior motives for choosing that particular movie? Just by looking at his excited expression one could see that he was earnestly into this genre.
Hence, Su-Jin fell into a predicament. She wasn't happy with his choice but, at the same time, she couldn't be upfront about it.
There was simply no way Su-Jin could say that she actually hated horror movies, that she absolutely despised them. Not only because they were frightening, but also because she found them very stupid.
On top of that, she also thought that people who liked this genre weren't in search of a good movie, with a strong plot or amazing actorship, but only looking for a good show instead. Just something to pass the time with.
That, or they simply wanted to make fun of those who were frightened. That way they could get a thrill out of it.