@Tcof
I mean "some personally do not mix" is can work.
What? That sentence makes zero sense. Assuming you're disagreeing, "context" is irrelevant to that statement. It is a simple fact, and the start of the story does not change or conflict with it.
1. Again, what? When it started is irrelevant. It started essentially the moment they met, she simply did not like him from the start. Bad impressions are irrelevant and have nothing to do with conflicting personality types. She knows him know and still dislikes him. How much "they have do with each other" is irrelevant. What you think "should be gone" is irrelevant.
2. Yes, it is. And yes, that does happen. And you're assuming that "nowhere" is the same for you as it is for her. And no, being told to think of someone you dislike and then thinking of someone you dislike is not an obsession.
You really need to work on your grammar and your arguments. Neither make sense. You're arguing nonsense. She simply does not like him because their personalities do not mix. Him going after someone she likes just adds fuel to that fire. You got your answer and you're rejecting it because you don't want to accept her actions in any facet and want to pigeon hole it as her simply being unreasonable.
How on Earth you're trying argue against: "Some people don't like each other" in response to "i still don't see how she hate MC that much." is ridiculous.