What kind of behavior annoys you most?

Condescension

Pretend the elephant in the room doesn't exist.

When someone is so afraid to seem unknowledgeable that they pretend to know the answer to something they don't, always ends up giving completely incorrect info

Arrogance, followed pretty closely by inauthenticity

People who consistently disregard the feelings or needs of others and act selfishly can be frustrating to interact with.

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Close-mindedness.