Final answer:
Elie Wiesel's dislike for phrases like "Have fun" and "relax" is likely due to his experience during the Holocaust, which instilled a sense of gravity and reflection in his views and writings.
Step-by-step explanation:
Elie Wiesel's aversion to such casual expressions as "Have fun" and "relax" can be connected to his traumatic experiences during the Holocaust. Having survived the concentration camps, Wiesel was intimately aware of the depths of human suffering and the importance of remembering and reflecting on these atrocities.
Therefore, he may find phrases focused on enjoyment or relaxation to be insensitive or trivial given the suffering and serious nature of his experiences and the world's. His literary works, reflecting on these themes, further suggest that his focus is often on somber reflection and the pursuit of meaning amidst adversity, rather than on casual enjoyment.