I’m like 99% sure that he is afraid of bald people. Whenever the reoccurring token bald guy shows up he gets really scared. He could just be afraid of robots, I remember he was afraid of batman’s robots too, I don’t believe batman is bald, but I’ve never seen batman without his suit. Superman has X-ray vision though, and I’m not sure he can turn that off so maybe he is afraid of batman because he is bald and not because he is afraid of robots.

Robots and bald people, final answer.

I turned on the sound to hear the air horn but there wasn’t one