@oristarA,
Yes, that might be a better choice. You would want to alter the sentence somewhat, too: "Or, in fact, is your taste sour?" The use of
de facto implies a comparative situation, such as: "The law requires the police to issue citations for violating the speed limit in that neighborhood, but the de facto situation is that they just stop people and give them warnings." The term originally enters English usage and become common through comparison to
de jure--so that
de jure is used to mean in law, and
de facto is used to mean in fact: "They were required to comply
de jure, but the
de facto situation was that they simply didn't report."
Using de facto both implies a comparison and implies a real situation as opposed to an ideal one. So the use of it above is awkward because there is no element of the real versus the ideal.