I'm very certain this show will give me "the feels" sooner or later
I don't want any of the girls to lose and this seems to go into a more dramatic direction than I thought.
I like Hatoko for what she does, she's aware that she is not the only one who likes Andou and is very honest with her feelings towards him. I can imagine how hard it is to have a rival in love who is also a very good friend... the fact that she is able to approach this and tries to take a stand is very brave of her.
It's pretty much a 'declaration of war', but that just proves how much she likes Andou.
The talk she had with Tomoyo also made clear how frustrating it must have been for her to spend these days with him.. especially right before she snapped. Andou is unreachable for her in his current state, it's so sad, she can't even do much about it.
What makes you think that she doesn't want to understand it? It's obvious that its the opposite, it's just impossible to understand. They call it a "syndrom" over there after all (even though it doesn't describe a mental disorder or medical condition).. you are not supposed to understand it, you just have to accept it, which she could if Andou allowed it - when Andou gave her the book she clearly said "I didn't like it, I tried to read it several times, but it teached me that people like different things and thats okay"and she clearly doesn't like all that shit she doesn't understand and even doesn't want to, so how can she love him?
what Andou did however is close to ignoring her after that
"You wouldn't understand, don't bother"
"Nah, it would be boring for you, let's not waste time talking about it"
These words must've hurt her alot, which is understandable considering how Andou acted and treated her right before she snapped.