Husband with dementia has developed a dislike for white cars.

My Hubby of 93 has developed a dislike for white cars - no matter the make or model. So, I thought it was just one of the quirks of dementia. I was talking to a friend today, who also cares for a dementia patient, and she mentioned how her person has a dislike for white cars also. Is this a pattern of dementia? The two dementia patients have no interaction with each other. Funny and interesting.