In Shuffle!, Kaede seems to always hold her chopsticks up while talking at table. According to a blog on chopstick etiquette, it's rude to do that.
You may be used to talking while holding your fork and knife. However, talking while holding your chopsticks is deemed to be terrible manners.
Is this a sign that Kaede does not care much about others, which is verified later in the anime by her being yandere?