I hate them because they annoy me. I don't annoy myself, so it's fine.
I'm always talking about how I really dislike other people remotely similar to me, so it shouldn't come as a surprise.
As for the yandere part, it'd be more of the "You're an integral part of my life and I can't stand losing you" than a " I love you and I'm doing everything for your sake" type of thing. At least I'm not likely to go chop-chop, methinks.
I'm very, very possessive and I like to stay clear of any moral code (which could serve as a deterrent for most people if it came down to radical actions), so I really think things would turn up badly if I entered a serious romantic relationship.
The fact I'm hard to approach (I'm generally good at approaching other people, though) coupled with how I stay away from most people makes actually entering a situation like that unlikely, at least.