Is it a bad sign if a guy forgets your hair color?

Set the scene: I was blonde. I talked to person. I dye my hair brown. I ask him if he likes me better blonde or brunette. He says- in total seriousness- that he's never seen me blonde. We've been going to school together since 5th grade, are now high school sophomores, and I've always been blonde up until recently. We've pretty much talked every day this semester except he has a thing where he like, doesn't actually look at someone while he's talking to them idk man