Answer:
"Pseudo-listening"
Explanation:
According to sociologists, what Derrick is doing to his grandfather is known as "Pseudo-listening". This is the behavior or acting as though you are listening but in fact you are either completely ignoring the person talking to you or just barely listening, meanwhile you are preoccupied on something else either in your mind or in the vicinity. People who use Pseudo-listening are doing it in order to not offend the person who is talking which is what Derrick has been doing.
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