Looking around to express likes and dislikes usually occurs in the conversation between two people. If a talks with B, B's eyes don't fall on a, but move around, or even look around, it is likely that B doesn't like a, or has no interest in a's conversation.
Turning to other places is a sign of losing interest in the conversation, which makes the other person feel the desire to escape. This is also a kind of instinct, that is not willing to face annoying people and things. So when you're talking to a particularly annoying person, you instinctively want to look elsewhere and find ways to get rid of that person. Most people have no way to refuse others rigidly. Out of politeness, they still want to carry on this conversation, but there is no way to stop their inner boredom, which will be expressed incisively and vividly in their body language.
Look around to express likes and dislikes
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