Weird question... anybody ever hear of beardies not liking the color white? Made a melamine enclosure a while ago, since i did he didn't seem to want to be on the floor. Since i put in tile, he has no problem. Sometimes when he poops in a spot on his hammock, i clean the poop and lay down a piece of ripped white t shirt until i can clean it more thoroughly, he won't go on the spot where the t shirt is.
I haven't heard of an aversion to white but they all have their quirks and this may be one. It's also possible he just doesn't want to go near the pooped in area which is relatively common.