In general, I don't think the people you hate the most from your quadra although I can see why people might sometimes think that for various reasons.

*You are more likely to get closer to people in your quadra, so you see their true flaws as well.

*They can disappoint you because at first you seem so compatible but then you find differences and start having conflicts. This is true for any relationship but it hurts more because you thought things were going so well.

*There is more likely to be a rivalry due to similar interests you are more likely to compete for the same territory.