I've always been suspicious of that. Why is it specifically OJ that tastes awful, and not other juices, or chocolate, or bread?
Bet a friend/family member that they can’t taste the difference between whole/2%/1%/skim milk, or some combination thereof. Blindfold them and have them begin tasting the milks. Now, replace the last milk with orange juice. The brain prepares the body for milk, and the unexpected acidity usually causes a gag reflex, and sometimes vomiting. Keep a bucket handy:
I vowed that day to stop drinking OJ and stick to water.
Never tried chocolate after brushing my teeth but I don't find 99% / unsweetened dark chocolate particularly offensive.