I asked ChatGPT who designed this thing, and I think this makes it clear why it’s so ugly (bold added by me):

The Tesla Cybertruck was primarily designed by Franz von Holzhausen, Tesla’s Chief Designer. Von Holzhausen has been responsible for the design of several Tesla models, including the Model S, Model 3, Model X, and Model Y. The Cybertruck, known for its unique, futuristic, and angular design, represents a significant departure from traditional truck designs and reflects von Holzhausen’s innovative approach to vehicle design. Elon Musk, Tesla’s CEO, also played a significant role in the conceptualization and design direction of the Cybertruck.