This is not an good example of factual relativism. It would be contradictory for all three of the answers to be correct for an individual. If he was to suggest that all three were true, then none of the statements could be “facts”. He can acknowledge that three are possible answers, but what he holds to be true for himself (relative truth) cannot consist of all three.
A better example of relative truth would be if Person A has a “Mystery Flavor!” Airhead. He then procceeds to share this Airhead with Person B. After both tasting the airhead, Person A suggests it is strawberry and person B suggests it is blueberry. Since neither can fully understand what the other person tastes, it would be impossible to tell the other person that what they are tasting is in fact, something else. So to person A he is eating a strawberry flavored candy and person B is eating a blueberry flavored candy. The decision of flavor may seem like opinion because it is not definite, but this is the foundation of relative truth. Also the term relative truth by definition is contradictory as “JackVK” posted earlier.