Was this joke offensive or another reason i didn't get?

https://gaming-cdn.com/images/products/21773/screenshot/berry-bury-berry-pc-steam-wallpaper-5.jpg?v=1772184909
image for context

I was playing berry bury berry and saw this white pink and blue camper. My brother was watching so i made the joke "I wonder if that's going to [become/transform] into a humanoid robot" or something along those lines, cause transformers. He said that i shouldn't make that joke. It was a while ago i don't remember exactly what either of us said but you get the idea.